I am trying to create my own Identity Model and Store using dapper.

But I am getting this error

Here is my sample code. Note I am using my custom MyIdentityUser and custom AddDapperStores.

builder.Services.AddIdentityCore<MyIdentityUser>(options => options.SignIn.RequireConfirmedAccount = true)
    .AddDapperStores()
    .AddSignInManager()
    .AddDefaultTokenProviders();

I have tried this custom MyIdentityUser and AddDapperStores in Blazor NET 6.0; it works perfectly.