In my MVC-5 application, I have to create security stamp values manually. The current implementation of the identity team seems to use a guid.
G
a bit late to the party, but these seem to work just fine:
await _userManager.UpdateSecurityStampAsync(user); await _userManager.UpdateNormalizedEmailAsync(user); await _userManager.UpdateNormalizedUserNameAsync(user); await _userManager.SetLockoutEnabledAsync(user, true);