Hi D M,
Thank you for reaching out. My name is Leo, a user just like you. I'd be happy to help you with your concern.
It seems that your account with the Office license wasn't recognized. May I know what changes that was made that might be causing the issue? Is it suddenly occurs? For this issue, I recommend trying to using the license removal tool so that it will remove the current installed license. To do this, follow the steps below:
"1. Download the license removal tool via https://go.microsoft.com/fwlink/?linkid=849815
2. Open the .pkg file from your Mac's Downloads folder.
3. Select Continue and follow the prompts in the setup wizard.
4. When you're ready to complete the license removal, select Install. You may need to enter your Mac's local admin account password.
After the tool successfully removes licenses, select Close.
- Uninstall the License Removal Tool by dragging the Microsoft_Office_License_Removal file from Finder > Downloads to Trash."
I pulled the above steps from Official Microsoft Support website. For reference, here's the link below:
https://support.microsoft.com/office/b032c0f6-a431-4dad-83a9-6b727c03b193
Once you have done it, try again using your account to activate Office. In case it won't work, other users have stated that they are able to log in using another alias, such as a mobile number connected to their account. I recommend trying this and checking if you are able to log in. If not, you can also create a new alias [https://go.microsoft.com/fwlink/?LinkId=529489](https://go.microsoft.com/fwlink/?LinkId=529489).](https://go.microsoft.com/fwlink/?LinkId=529489%29.) You can add either an email ending with "@outlook.com" or a mobile number, then set it as primary and try using it to log in. I hope it works on your end. In case the issue still persists, please let us know so that we can provide further assistance. We, the community users, are always here to help.
Your understanding and patience will be highly appreciated. I hope I provided a helpful information regarding your concern! Let me know if you have any further questions. Be safe always!
Best Regards,
Leo