in app/Data/AppUserStore.cs [122:130]
public Task SetPasswordHashAsync(AppUser user, string passwordHash, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
if (user == null) throw new ArgumentNullException(nameof(user));
if (passwordHash == null) throw new ArgumentNullException(nameof(passwordHash));
user.PasswordHash = passwordHash;
return Task.FromResult<object>(null);
}