Autodesk killed off reauthorizing of 2010 and older software as of August 31 2019 https://knowledge.autodesk.com/support/autocad/learn-explore/caas/simplecontent/content/previous-ver...
Sorry, you missed the deadline. There is nothing you can do about it today. Nothing. Nada. Zip.
HTH
You can speak to your lawyer and ask him to contact Autodesk like I and others did.A perpetual license by definition,common understanding and law does not have a expiration date.There is not one stated in the eula pre August 31, 2019.So when you bought your perpetual, you have agreed to its current(date of purchase) and not future clauses.