Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi,
Did you install other version of Office in Mac before?
I suggest you refer to this support article to uninstall Office from Mac completely:
Then re-install Office and activate with Microsoft 365 account.
Please make sure you have install the latest updates for Excel.
Just checking in to see if the information was helpful. Please let us know if you would like further assistance.
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.