Hello JohanValstar,
Thank you for posting in Microsoft Community forum.
It sounds like you're having trouble adding your personal Microsoft account to your Windows 11 Pro computer.
Here are a few things you could try:
- Check if there are any group policies or settings on your domain that might be preventing you from adding a personal account.
- Make sure that your computer is up to date with the latest Windows updates and patches. Sometimes, issues like this can be resolved by installing the latest updates.
- Try creating a new local user account on your computer and see if you're able to add your personal Microsoft account to that account. If it works, then there might be an issue with your original user account.
- If all else fails, you could try reinstalling Windows 11 Pro on your computer. In fact, you seem to be ready to give it a try. So make sure to back up any important files before doing so.
In addition, it seems like your issue is related to Office 365, so you could try posting in the Office 365 section for help, as someone may have encountered the same issue.
I hope the information above is helpful.
If you have any question or concern, please feel free to let us know.
Best Regards,
Haijian Shan