Odtnhj

I am trying to create a new entry in my database with EF Core like this:

RefreshToken newDBRefreshToken = new RefreshToken()

 Id = 0,
 Token = refreshToken,
 AccessToken = accessToken,
 UserId = userId
;

_dbContext.RefreshToken.Add(newDBRefreshToken);

I get this error message upon saving:

The foreign key 'UserId: 5b82dbb0-c38b-4144-b51d-e092ef6f5e55' set
on 'RefreshToken' with the key value 'Id: -2147482647' matches an
entity of type 'IdentityUser', however the principal entity type
should be assignable to 'ApplicationUser'.

I have two Entities:

//To make it possible to use AspNetUsers as a reference table
public class ApplicationUser : IdentityUser



public class RefreshToken : BaseEntity //Has int Id and CreateDate ect...

 //Reference the IdentityUser
 public string UserId get; set; 
 public ApplicationUser User get; set; 

 public string Token get; set; 
 public string AccessToken get; set; 
 public DateTime ValidUntil get; set; 

the migration created my RefreshToken table like this:

Edit:
This is my Startup.cs section:

services.AddDbContext<ApiContext>(options =>
 options.UseSqlServer(connection, builder => builder.MigrationsAssembly(typeof(Startup).Assembly.FullName)
 ).EnableSensitiveDataLogging(true));

// ===== Add Identity ========
services.AddIdentity<ApplicationUser, IdentityRole>()
 .AddEntityFrameworkStores<ApiContext>()
 .AddErrorDescriber<IdentityErrorDescriberDE>()
 .AddDefaultTokenProviders();

I tried using ApplicationUser as TUser, which gives me this error:

InvalidOperationException: Unable to resolve service for type
'Microsoft.AspNetCore.Identity.UserManager`1[Microsoft.AspNetCore.Identity.IdentityUser]'
while attempting to activate 'Web.Controllers.AccountController'.

This is my Context:

public class ApiContext : IdentityDbContext 
...