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Pease attach screen shot with error message, and write your serial number for us to check.
But I am afraid you have to register Service Request either by Subscription Center or thru dealer.
I attach the error message (containing Serial Number).
I also tried to register through my Autodesk account but I get the same message.
Besides this forum I requested help by e-mailing at the following address:
You can not log in to subscription center because your subscription has expired
authcodes@autodesk.com This is the correct e-mail address to report this problem