How to run background task? keep getting System.AggregateException

This is my program.cs

using TestEmailTaskScheduler.Controllers;
using TestEmailTaskScheduler.Models;
using System.Configuration;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();
builder.Services.AddSingleton<EmailService>();
builder.Services.AddHostedService<EmailService>();
builder.Configuration.GetSection("DailyEmail").Get<MySettingsModel>();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();

And this is a part of the test code in my controller service:

using Microsoft.Extensions.Options;
using TestEmailTaskScheduler.Models;
using System.Data;
using System.Net;
using System.Net.Mail;
using System.Configuration;

namespace TestEmailTaskScheduler.Controllers
{
    public class EmailService : BackgroundService
    {
        private const int generalDelay = 1 * 10 * 1000; // 10 seconds
        private readonly IOptions<MySettingsModel> appSettings;
        private readonly IOptions<MyDatabaseModel> databaseSettings;
        private Timer Schedular;

    public EmailService(IOptions<MySettingsModel> app)
    {
        appSettings = app;
    }
    public EmailService(IOptions<MyDatabaseModel> dbs)
    {
        databaseSettings = dbs!;
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        while (!stoppingToken.IsCancellationRequested)
        {
            await Task.Delay(generalDelay, stoppingToken);
            await DoBackupAsync();
        }
    }

    private Task DoBackupAsync()
    {
        // here i can write logic for taking backup at midnight
        if (IsMidnight())
        {
            Console.WriteLine("Executing background task");
            //SendEmail();
        }

        return Task.FromResult("Done");
    }

Error: System.AggregateException: 'Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: TestEmailTaskScheduler.Controllers.EmailService Lifetime: Singleton ImplementationType: TestEmailTaskScheduler.Controllers.EmailService': Unable to activate type 'TestEmailTaskScheduler.Controllers.EmailService'. The following constructors are ambiguous: Void .ctor(Microsoft.Extensions.Options.IOptions1[TestEmailTaskScheduler.Models.MySettingsModel]) Void .ctor(Microsoft.Extensions.Options.IOptions1[TestEmailTaskScheduler.Models.MyDatabaseModel])) (Error while validating the service descriptor 'ServiceType: Microsoft.Extensions.Hosting.IHostedService Lifetime: Singleton ImplementationType: TestEmailTaskScheduler.Controllers.EmailService': Unable to activate type 'TestEmailTaskScheduler.Controllers.EmailService'. The following constructors are ambiguous: Void .ctor(Microsoft.Extensions.Options.IOptions1[TestEmailTaskScheduler.Models.MySettingsModel]) Void .ctor(Microsoft.Extensions.Options.IOptions1[TestEmailTaskScheduler.Models.MyDatabaseModel]))'

Why is this happening? I thought it is already called in the program.cs?