We are experiencing the same thing here. Past two weeks start of semester has went fine, then suddenly this week many students are getting the "unknown error occurred" message when attempting to sign in to shared iPad. It seems to be occurring randomly, every class session sometimes it will only be 1 student in a room or like earlier today multiple rooms with over 50% unable to login.
Things we have tried:
Switching user to a different iPad - does not work
Hard restarting iPad - does not work
Making sure all management commands are cleared, no sync pending users, sending restart command before class starts - not really helping
Resetting student iPad passcode via ASM - typically works, but we have way too many students with the issue to consistently reset passcodes. And as you'll see in the next bullet point we're not sure this is the solution since students are entering the same correct password they've used the past 2 weeks.
Doing absolutely nothing (maybe a hard reboot) and waiting 20-30 minutes before student tries to login again - sometimes working???!
@Bird97 Have you found anything out the past couple days? Your post here was the only one I found when trying to research the issue. In the meantime we are directing students seeing the error to just login as Guest on the iPad or some are using personal devices. But this is really a big hangup in our environment right now and we are at a loss as to the cause.