I am working on an ASP.NET Core MVC 6 application that uses ASP.NET Core identity and when I try to create new user by using UserManager I get this error:

"User name '' is invalid, can only contain letters or digits."

Code:

var user = new User
{
    Name = "my name",
    UserName = "any user name",
    Email = "[email protected]",
    EmailConfirmed = true
};

var result = await _userManager.CreateAsync(user, "123723-Aa");