I'm having the same problem - tried Adobe Tech Support, they can't seem to figure it out either.
Okay, was able to get in touch with Adobe Tech Support again - they then accessed my computer and were able to fix the problem. They likely did what MikeGondek is recommending below, along with cleaning up duplicate fonts. Problem is now fixed and I can get back to work!
Yes, my issue is fixed with the help of the support team. In addition, after they access my computer, I had to update my MacOs to the latest ver. 12.2.1. Hopefully, this issue won't happen again.
Your OOBE being corrupt could cause this, as that is what manages your serialization. If you stil need more help, let us know your OS version please.
OOBE RESET MAC
OOBE RESET WIN