Same issue been happening a lot lately.
The form keeps opening on startup and I complete it each time then close it. Sometimes Alteryx functions as it should, other times it freezes and I have to close in task manager and start again. Very frustrating!
This issue has been reported by other users on versions 2023.1 & 2023.2. Applying the latest patch seems to resolve this issue. The other possible solution is to update a certificate.
This Knowledge Base article gives more details. Alteryx Designer 2023.2, 2023.1: Alteryx Registration window appears randomly even when licensed