Hi
Welcome to the Microsoft community.
I understand that you are suffering from the problem of "You can't rename your computer normally." If my understanding is wrong, please feel free to reply and correct me.
You can check this link, follow the steps to remove your device from Microsoft's official website, and then add it again to see if it can be resolved.
You are welcome to reply to this topic at any time, and sincerely thank you for your support of Microsoft products and services.
Best regards
Derrick Qian | Microsoft Community Support Specialist
* Beware of scammers posting fake support numbers here.
* Please check and vote this answer if it helps as it will be beneficial to more community members reading here.