Dapr / Aspire PubSub not loading component yaml

I am attempting to setup a project with Aspire and DAPR.

I want to register a sidecar in my API and Frontend application that will use pubsub. The pubsub should come from a DAPR yaml component file.

I have wired up the DaprClient and created an endpoint on Frontend and API to receive a HHTP Post /publish. When I call this endpoint I get the following exception:

curl --request POST 'http://localhost:5133/publish'

Dapr.DaprException: Publish operation failed: the Dapr endpoint indicated a failure. See InnerException for details. ---> Grpc.Core.RpcException: Status(StatusCode="InvalidArgument", Detail="pubsub pubsub is not found") at Dapr.Client.DaprClientGrpc.MakePublishRequest(String pubsubName, String topicName, ByteString content, Dictionary2 metadata, String dataContentType, CancellationToken cancellationToken) --- End of inner exception stack trace --- at Dapr.Client.DaprClientGrpc.MakePublishRequest(String pubsubName, String topicName, ByteString content, Dictionary2 metadata, String dataContentType, CancellationToken cancellationToken) at Program.<>c.<<$>b__0_2>d.MoveNext() in C:\Users\myusername\source\repos\AspireApps\AspireApps.Web\Program.cs:line 42 --- End of stack trace from previous location --- at Microsoft.AspNetCore.Http.RequestDelegateFactory.ExecuteTaskResult[T](Task`1 task, HttpContext httpContext) at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)

HEADERS Accept: / Host: localhost:5133 User-Agent: curl/8.13.0

My project stucture is as follow:

AspireApp
├───AspireApps.ApiService
│   ├───bin
│   │   └───...
│   ├───obj
│   │   └───...
│   └───Properties
├───AspireApps.AppHost
│   ├───bin
│   │   └───...
│   ├───obj
│   │   └───...
│   └───Properties
├───AspireApps.ServiceDefaults
│   ├───bin
│   │   └───...
│   └───obj
│       └───...
├───AspireApps.Web
│   ├───bin
│   │   └───...
│   ├───Components
│   │   ├───Layout
│   │   └───Pages
│   ├───obj
│   │   └───Debug
│   │       └───net9.0
│   │           ├───...
│   ├───Properties
│   └───wwwroot
│       └───lib
│           └───...
└───dapr
    └───components
        └─── pubsub.yaml

AppHost.cs

using CommunityToolkit.Aspire.Hosting.Dapr;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

var builder = DistributedApplication.CreateBuilder(args);

var cache = builder.AddRedis("cache").WithDbGate();

var daprState = builder.AddDaprStateStore("statestore");

DaprSidecarOptions sideCarOptions = new DaprSidecarOptions
{
    EnableAppHealthCheck = true,
    AppHealthCheckPath = "/health",
};

IResourceBuilder<RabbitMQServerResource>? rabbitmq = null;
var pubSubType = "pubsub.azure.servicebus";

if (builder.Environment.IsDevelopment())
{
    var username = builder.AddParameterFromConfiguration("rabbitmq-username", "guest", true);
    var password = builder.AddParameterFromConfiguration("rabbitmq-password", "guest", true);
    rabbitmq = builder.AddRabbitMQ("rabbitmq", username, password)
        .WithManagementPlugin();

    pubSubType = "pubsub.rabbitmq";
}
var daprPubSubBuilder = builder.AddDaprComponent("pubsub", pubSubType, new DaprComponentOptions
{
    LocalPath = Path.Combine("..", "dapr", "components")
});

var apiService = builder.AddProject<Projects.AspireApps_ApiService>("apiservice")
    .WithHttpHealthCheck("/health")
    .WithReference(cache)
    .WaitFor(cache)
    .WithDaprSidecar(sideCarOptions)
    .WithReference(daprState)
    .WithReference(daprPubSubBuilder);

// Wait for RabbitMQ in development
if (rabbitmq != null)
{
    apiService = apiService.WithReference(rabbitmq).WaitFor(rabbitmq);
}

var webFrontend = builder.AddProject<Projects.AspireApps_Web>("webfrontend")
    .WithExternalHttpEndpoints()
    .WithHttpHealthCheck("/health")
    .WithReference(cache)
    .WaitFor(cache)
    .WithDaprSidecar(sideCarOptions)
    .WithReference(daprState)
    .WithReference(daprPubSubBuilder)
    .WithReference(apiService)
    .WaitFor(apiService);

// Wait for RabbitMQ in development
if (rabbitmq != null)
{
    webFrontend = webFrontend.WithReference(rabbitmq).WaitFor(rabbitmq);
}

//Inject Dapr client for DI / service-to-service calls
builder.Services.AddDaprClient();

builder.Build().Run();

pubsub.yaml (i've tried this with and without the scopes)

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: pubsub
spec:
  type: pubsub.rabbitmq
  version: v1
  metadata:
  - name: host
    value: amqp://guest:guest@rabbitmq:5672
  - name: durable
    value: "true"
  - name: deletedWhenUnused
    value: "false"
  - name: autoAck
    value: "false"
  - name: deliveryMode
    value: "2"
  - name: requeueInFailure
    value: "true"
scopes:
- webfrontend
- apiservice

When the application launches, Aspire's dashboard lights up green.

I do see in the sidecar console logs a message:

level=warning msg="A non-YAML resiliency file components was detected, it will not be loaded" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10

WARNING: no application command found. Starting Dapr with id apiservice. HTTP Port: 59008. gRPC Port: 59006 time="2025-09-05T12:49:39.777069+01:00" level=info msg="Starting Dapr Runtime -- version 1.15.10 -- commit 0f5f0b75a944d56c0b78b5d8db31c268a1f21d90" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.777069+01:00" level=info msg="Log level set to: info" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.7776962+01:00" level=warning msg="mTLS is disabled. Skipping certificate request and tls validation" app_id=apiservice instance=mymachinename scope=dapr.runtime.security type=log ver=1.15.10 time="2025-09-05T12:49:39.7841769+01:00" level=info msg="Enabled features: SchedulerReminders" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.7846949+01:00" level=info msg="metric spec: {"enabled":true}" app_id=apiservice instance=mymachinename scope=dapr.runtime.diagnostics type=log ver=1.15.10 time="2025-09-05T12:49:39.7846949+01:00" level=info msg="Using default latency distribution buckets: [1 2 3 4 5 6 8 10 13 16 20 25 30 40 50 65 80 100 130 160 200 250 300 400 500 650 800 1000 2000 5000 10000 20000 50000 100000]" app_id=apiservice instance=mymachinename scope=dapr.runtime.diagnostics type=log ver=1.15.10 time="2025-09-05T12:49:39.7846949+01:00" level=warning msg="The default value for 'spec.metric.http.increasedCardinality' will change to 'false' in Dapr 1.15 or later" app_id=apiservice instance=mymachinename scope=dapr.runtime.diagnostics type=log ver=1.15.10 time="2025-09-05T12:49:39.7865149+01:00" level=warning msg="A non-YAML resiliency file components was detected, it will not be loaded" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.7865727+01:00" level=info msg="standalone mode configured" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.7865727+01:00" level=info msg="app id: apiservice" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.7876633+01:00" level=info msg="Dapr trace sampler initialized: ParentBased{root:AlwaysOnSampler,remoteParentSampled:AlwaysOnSampler,remoteParentNotSampled:AlwaysOffSampler,localParentSampled:AlwaysOnSampler,localParentNotSampled:AlwaysOffSampler}" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.7882915+01:00" level=info msg="metrics server started on 0.0.0.0:59010/" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8285502+01:00" level=info msg="local service entry announced: apiservice -> 10.114.236.36:56419" app_id=apiservice component="nr (mdns/v1)" instance=mymachinename scope=dapr.contrib type=log ver=1.15.10 time="2025-09-05T12:49:39.8290925+01:00" level=info msg="Initialized name resolution to mdns" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8291985+01:00" level=info msg="Loading components…" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8313238+01:00" level=info msg="Waiting for all outstanding components to be processed…" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8319286+01:00" level=info msg="Component loaded: statestore (state.in-memory/v1)" app_id=apiservice instance=mymachinename scope=dapr.runtime.processor type=log ver=1.15.10 time="2025-09-05T12:49:39.8319286+01:00" level=info msg="All outstanding components processed" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8319286+01:00" level=info msg="Loading endpoints…" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8330666+01:00" level=info msg="Waiting for all outstanding http endpoints to be processed…" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8332717+01:00" level=info msg="All outstanding http endpoints processed" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8332717+01:00" level=info msg="Loading Declarative Subscriptions…" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8365689+01:00" level=info msg="gRPC server listening on TCP address: :59006" app_id=apiservice instance=mymachinename scope=dapr.runtime.grpc.api type=log ver=1.15.10 time="2025-09-05T12:49:39.8365689+01:00" level=info msg="Enabled gRPC tracing middleware" app_id=apiservice instance=mymachinename scope=dapr.runtime.grpc.api type=log ver=1.15.10 time="2025-09-05T12:49:39.8365689+01:00" level=info msg="Enabled gRPC metrics middleware" app_id=apiservice instance=mymachinename scope=dapr.runtime.grpc.api type=log ver=1.15.10 time="2025-09-05T12:49:39.8365689+01:00" level=info msg="Registering workflow engine for gRPC endpoint: [::]:59006" app_id=apiservice instance=mymachinename scope=dapr.runtime.grpc.api type=log ver=1.15.10 time="2025-09-05T12:49:39.8365689+01:00" level=info msg="API gRPC server is running on port 59006" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8365689+01:00" level=warning msg="The default value for 'spec.metric.http.increasedCardinality' will change to 'false' in Dapr 1.15 or later" app_id=apiservice instance=mymachinename scope=dapr.runtime.http type=log ver=1.15.10 time="2025-09-05T12:49:39.8377913+01:00" level=info msg="Enabled max body size HTTP middleware with size 4194304 bytes" app_id=apiservice instance=mymachinename scope=dapr.runtime.http type=log ver=1.15.10 time="2025-09-05T12:49:39.8378438+01:00" level=info msg="Enabled tracing HTTP middleware" app_id=apiservice instance=mymachinename scope=dapr.runtime.http type=log ver=1.15.10 time="2025-09-05T12:49:39.8378438+01:00" level=info msg="Enabled metrics HTTP middleware" app_id=apiservice instance=mymachinename scope=dapr.runtime.http type=log ver=1.15.10 time="2025-09-05T12:49:39.8384367+01:00" level=info msg="HTTP server listening on TCP address: :59008" app_id=apiservice instance=mymachinename scope=dapr.runtime.http type=log ver=1.15.10 time="2025-09-05T12:49:39.8389811+01:00" level=info msg="HTTP server is running on port 59008" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8389811+01:00" level=info msg="The request body size parameter is: 4194304 bytes" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8389811+01:00" level=info msg="gRPC server listening on TCP address: :56419" app_id=apiservice instance=mymachinename scope=dapr.runtime.grpc.internal type=log ver=1.15.10 time="2025-09-05T12:49:39.8389811+01:00" level=info msg="Enabled gRPC tracing middleware" app_id=apiservice instance=mymachinename scope=dapr.runtime.grpc.internal type=log ver=1.15.10 time="2025-09-05T12:49:39.8389811+01:00" level=info msg="Enabled gRPC metrics middleware" app_id=apiservice instance=mymachinename scope=dapr.runtime.grpc.internal type=log ver=1.15.10 time="2025-09-05T12:49:39.8389811+01:00" level=info msg="Internal gRPC server is running on :56419" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8416276+01:00" level=info msg="actors: state store is not configured - this is okay for clients but services with hosted actors will fail to initialize!" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8417428+01:00" level=info msg="Actor state store not configured - actor hosting disabled, but invocation enabled" app_id=apiservice instance=mymachinename scope=dapr.runtime.actor type=log ver=1.15.10 time="2025-09-05T12:49:39.8422631+01:00" level=info msg="application protocol: http. waiting on port 5506. This will block until the app is listening on that port." app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8425038+01:00" level=info msg="Actor runtime started" app_id=apiservice instance=mymachinename scope=dapr.runtime.actor type=log ver=1.15.10 time="2025-09-05T12:49:39.8425038+01:00" level=info msg="worker started with backend dapr.actors/v1" app_id=apiservice instance=mymachinename scope=dapr.wfengine.durabletask.backend type=log ver=1.15.10 time="2025-09-05T12:49:39.8425038+01:00" level=warning msg="Graceful shutdown timeout is infinite, will wait indefinitely to shutdown" app_id=apiservice instance=mymachinename scope=dapr.runtime.actor type=log ver=1.15.10 time="2025-09-05T12:49:39.8425038+01:00" level=info msg="Workflow engine started" app_id=apiservice instance=mymachinename scope=dapr.runtime.wfengine type=log ver=1.15.10 time="2025-09-05T12:49:39.8430499+01:00" level=info msg="Reporting actor types: []" app_id=apiservice instance=mymachinename scope=dapr.runtime.actors.placement type=log ver=1.15.10 time="2025-09-05T12:49:39.8431251+01:00" level=info msg="Connected to placement localhost:6050" app_id=apiservice instance=mymachinename scope=dapr.runtime.actors.placement.client.connector.static type=log ver=1.15.10 time="2025-09-05T12:49:39.8448018+01:00" level=info msg="application discovered on port 5506" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8448018+01:00" level=info msg="App health probes starting" app_id=apiservice instance=mymachinename scope=dapr.apphealth type=log ver=1.15.10 time="2025-09-05T12:49:39.8448018+01:00" level=info msg="dapr initialized. Status: Running. Init Elapsed 58ms" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:49:39.8510653+01:00" level=info msg="Connected to placement localhost:6050" app_id=apiservice instance=mymachinename scope=dapr.runtime.actors.placement.client type=log ver=1.15.10 time="2025-09-05T12:49:39.8581726+01:00" level=info msg="Connected and received scheduler hosts addresses: [localhost:6060]" app_id=apiservice instance=mymachinename scope=dapr.runtime.scheduler.watchhosts type=log ver=1.15.10 time="2025-09-05T12:49:39.8587389+01:00" level=info msg="Scheduler client initialized for address: localhost:6060" app_id=apiservice instance=mymachinename scope=dapr.runtime.scheduler.clients type=log ver=1.15.10 time="2025-09-05T12:49:39.8587389+01:00" level=info msg="Scheduler clients initialized" app_id=apiservice instance=mymachinename scope=dapr.runtime.scheduler.clients type=log ver=1.15.10 time="2025-09-05T12:49:39.8982609+01:00" level=info msg="Placement tables updated, version: 0" app_id=apiservice instance=mymachinename scope=dapr.runtime.actors.placement type=log ver=1.15.10 You're up and running! Dapr logs will appear here.
time="2025-09-05T12:50:04.85723+01:00" level=info msg="App entered healthy status" app_id=apiservice instance=mymachinename scope=dapr.apphealth type=log ver=1.15.10 time="2025-09-05T12:50:04.8631114+01:00" level=info msg="Application configuration loaded" app_id=apiservice instance=mymachinename scope=dapr.runtime type=log ver=1.15.10 time="2025-09-05T12:50:04.8631114+01:00" level=info msg="Registering hosted actors: []" app_id=apiservice instance=mymachinename scope=dapr.runtime.actor type=log ver=1.15.10 time="2025-09-05T12:50:04.8631114+01:00" level=info msg="Updating actor types: []" app_id=apiservice instance=mymachinename scope=dapr.runtime.actors.placement type=log ver=1.15.10 time="2025-09-05T12:50:04.8636744+01:00" level=info msg="Scheduler stream connected for [JOB_TARGET_TYPE_JOB]" app_id=apiservice instance=mymachinename scope=dapr.runtime.scheduler.cluster type=log ver=1.15.10

Running command dapr list

APP ID HTTP PORT GRPC PORT APP PORT COMMAND AGE CREATED

DAPRD PID CLI PID APP PID webfrontend 59007 59004 5133 3m 2025-09-05 12:49.39 37448 29752 0

apiservice 63121 63120 5506 1m 2025-09-05 12:51.44 25296 38188 0

Querying the metadata of the sidecar shows that the component is not loaded:

curl http://localhost:59007/v1.0/metadata

❮ {"id":"webfrontend","runtimeVersion":"1.15.10","enabledFeatures":["SchedulerReminders"],"components":[{"name":"statestore","type":"state.in-memory","version":"v1","capabilities":["ETAG","TRANSACTIONAL","TTL","DELETE_WITH_PREFIX","ACTOR"]}],"extended":{"cliPID":"29752","daprRuntimeVersion":"1.15.10"},"appConnectionProperties":{"port":5133,"protocol":"http","channelAddress":"localhost","health":{"healthCheckPath":"/health","healthProbeInterval":"5s","healthProbeTimeout":"500ms","healthThreshold":3}},"actorRuntime":{"runtimeStatus":"RUNNING","hostReady":true,"placement":"placement: connected"},"scheduler":{"connected_addresses":["localhost:6060"]}}