I consider this a bug but apparently its “intended” per twitter “support” and I think it should be changed.
Basicly, if using Managed users, when signing in on the Web and devices with e-mail/username and pass, it skips user selection dumping you in the main/admin user, EVEN IF said user has a pin enabled.
I think it should take you to user selection whether or not there is a PIN, but it should definitely not bypass the PIN if enabled.