Aggressive outbound firewall blocks frequently trigger error 001522 by stopping communication with external licensing servers.

If the error persists after these steps, it is recommended to contact Autodesk Registration & Activation directly for a fresh activation code. registration-activation error (0015.111) - Forums, Autodesk

Before doing anything else, simply double-check the name of the .txt file you are trying to upload to the online registration portal. Confirm its exact filename. It should likely be activation_request.txt . If it's named anything else, like transfer_request.txt , you've found the problem.

While the 001522 error is application-specific, many users might encounter it while struggling with more general Windows activation issues, especially after a major hardware change or system reinstallation. To provide a complete resource, here is a guide to common Windows activation errors and how to fix them.

Resolving this validation issue requires systematically checking local network configurations, cleaning system licensing caches, and correcting registration data. Root Causes of Error 001522