You cannot sign in to iMessage on this Mac at this time.To use iMessage with this Mac, contact Apple Support and provide the code below.

I have a 2011 macbook pro and i was trying to login my apple Id in iMessage but every time I try to login it says

You cannot sign in to iMessage on this Mac at this time.To use iMessage with this Mac, contact Apple Support and provide the code below.

Customer Code: 2***-****-****

Apple ID:

I don't understand what to do so please help me.