IMessage won't sign me in

So I have a school laptop (macbook air), and they have recently updated the OS X. It has signed me out of iMessage. When I try to sign in, the accounts page comes up. When I sign in, it says the following: "The server has encountered an error processing registration. please try again later." I have the same account logged in on my iPod, and it works fine. The account on my laptop has been showing this alert for the past day. please help. thanks

The problem should be solved by the school's IT staff.

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IMessage won't sign me in

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