Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi,
I'm Tim, an Independent Consultant here and a Microsoft user like you. I don't work for Microsoft and do not have access to any of your data on their system.
I would recommend using the Microsoft Office removal tool to remove all traces of Office.
https://aka.ms/SaRA-officeUninstallFromPC
Then you should be able to continue.
I hope this information helps. If you have any questions, please let me know and I'll be glad to assist you further or If you find it helpful, you can mark this comment as the answer.
Kind regards
Tim