Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi, Jeff Martin4
Welcome to Microsoft Community.
I understand that after you installed Microsoft Office 2021 on your Mac, the license shown remains Office 2019.
If this happens on Mac, first consider the case that the previous license of Office 2019 was not cleared. You can manually clear the license information in the way mentioned in the following link(Just proceed to step 4):
How to remove Office license files on a Mac - Microsoft Support
If the problem persists then it is recommended that you uninstall your current Mac and then reinstall the Office software by doing the following:
Download and install or reinstall Microsoft 365 or Office 2021 on a PC or Mac - Microsoft Support
Please let me know how you are doing and contact me if you need further assistance.
Looking forward to your reply.
Best Regards,
Mila.L-MSFT| Microsoft Community Support Specialist