While modifying .NET Core's Identity files, I stumbled upon this error:
NotSupportedException: No IUserTwoFactorTokenProvider<TUser> named 'Default' is registered.
Microsoft.AspNetCore.Identity.UserManager<TUser>.GenerateUserTokenAsync function couldn't generate a token because no provider was available upon registering a new user. This error has an easy fix though!
If you're like me, you changed
AddDefaultIdentity in the
Startup.cs file to
AddIdentity. I wanted to implement my own user that inherited from the base user. By doing this I lost the default token providers. The fix was to add them back with
services.AddIdentity<User, UserRole>() .AddEntityFrameworkStores<ApplicationDbContext>() .AddDefaultTokenProviders();
After that fix, everything worked again!