If you have a valid license on the linked Microsoft account, but the local install doesn't recognize it:
Open Admin Command Prompt, change to the following folder (or similar depending on your version), the folder should have the file 'ospp.vbs' in it:
C:\Program Files\Microsoft Office\Office16
C:\Program Files (x86)\Microsoft Office\Office16

1: cscript ospp.vbs /dstatus

2: Run the following, changing ABCDE to the last 5 of the product key from the above command:
cscript ospp.vbs /unpkey:ABCDE

3: Restart the computer. You might only have to restart one of the Office apps instead...


https://community.spiceworks.com/how_to/48973-remove-and-re-add-license-key-for-office-2016-on-office-365

Keywords: Microsoft Office 365, Word, Excel, Outlook, Access, Activation, License, Unlicensed, Trial, Expired