Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Bianca,
Are you facing this issue with Office 2016?
If yes, from where did you purchase Office 2016?
You may please refer to the “Troubleshoot product key problems” section in the below article to check if it helps.
Hope the information helps, do reply if you need further assistance.
Thank you.