DirectX11 creating input layout throws error on input signature not matching shader (instancing)

The input layout

D3D11_INPUT_ELEMENT_DESC layout[] = {
            {"Position", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0},
            {"Normal", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 12, D3D11_INPUT_PER_VERTEX_DATA, 0},
            {"Transform", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 1, 0, D3D11_INPUT_PER_INSTANCE_DATA, 1},
            {"Transform", 1, DXGI_FORMAT_R32G32B32A32_FLOAT, 1, 16, D3D11_INPUT_PER_INSTANCE_DATA, 1},
            {"Transform", 2, DXGI_FORMAT_R32G32B32A32_FLOAT, 1, 32, D3D11_INPUT_PER_INSTANCE_DATA, 1},
            {"Transform", 3, DXGI_FORMAT_R32G32B32A32_FLOAT, 1, 48, D3D11_INPUT_PER_INSTANCE_DATA, 1},
            {"Color", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 1, 64, D3D11_INPUT_PER_INSTANCE_DATA, 1},
};

The vertex shader

cbuffer CBuf
{
    matrix model;
    matrix modelViewProj;
};
struct VSIn
{
    float3 pos : Position;
    float3 n : Normal;
    row_major float4x4 transform : Transform;
    float4 color : Color;
};
struct VSOut
{
    float3 worldPos : Position;
    float3 normal : Normal;
    float4 pos : SV_Position;
    float4 color : Color;
};
VSOut main(VSIn input)
{
    VSOut vso;
    vso.worldPos = (float3) mul(float4(input.pos, 1.0f), input.transform);
    vso.normal = mul(input.n, (float3x3) input.transform);
    vso.pos = mul(float4(input.pos, 1.0f), modelViewProj);
    vso.color = input.color;
    return vso;
}

The error

ID3D11Device::CreateInputLayout: The provided input signature expects to read an element with SemanticName/Index: 'Transform'/0, but the declaration doesn't provide a matching name.
D3D11Device::CreateInputLayout: The provided input signature expects to read an element with SemanticName/Index: 'Transform'/1, but the declaration doesn't provide a matching name.
D3D11Device::CreateInputLayout: The provided input signature expects to read an element with SemanticName/Index: 'Transform'/2, but the declaration doesn't provide a matching name.
D3D11Device::CreateInputLayout: The provided input signature expects to read an element with SemanticName/Index: 'Transform'/3, but the declaration doesn't provide a matching name.
D3D11Device::CreateInputLayout: The provided input signature expects to read an element with SemanticName/Index: 'Color'/0, but the declaration doesn't provide a matching name.

[Error Code] 0x80070057 (2147942487)
[Error String] E_INVALIDARG
[Description] The parameter is incorrect.

The error is thrown on CreateInputLayout before I draw anything to screen. I previously had this whole setup working with normal non instanced drawing. I understand that the error means the input layout doesn't match the shader declaration but I can't see which part does not match. VSIn contains a semantic name for Position, Normal, Transform and Color.

Research:

• Other Questions
  • Binding an Instance Matrix with an InputLayout
• Examples
  • https://github.com/walbourn/directx-sdk-samples/blob/main/InstancingFX11/Instancing.cpp
  • http://www.rastertek.com/dx11tut37.html

So for what I have tried after reading the above:

• Use D3D11_APPEND_ALIGNED_ELEMENT instead of manually calculating the offsets
• Split up the Transform matrix into four float4s with numbered semantic names
• Binding just the color and removing the transform from both the input description and the shader (same error but only concerning color).
• Ensure the shader that is loaded is the correct shader
• Delete the generated .cso file to make sure the shader recompiles
• Change the semantic names to different strings in case of reserved identifiers