After installing AutoCad 2020, the serial number was entered and the product was successfully activated. If you now start the program, a new serial number or another user will be requested.
"After installing AutoCad 2020, the serial number was entered and the product was successfully activated. If you now start the program, a new serial number or another user will be requested."
It doesn't sound like a question, what is it exactly that you are asking? Can you post a screenshot of the error message you are seeing (if there is any)?
Or is this what you are seeing?: https://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/Contac...
Is this what you're getting:
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