Microsoft Office cannot verify the license for this product. how to fix it?

1

Open Word.

At the top right of Word, log out of Office.

Restart (not shut down) your PC, then log back into Office, is your licence/subscription then recognized correctly.

2

If that does not resolve the problem,

Important: before performing this process, please log into your Microsoft account on this link (https://account.microsoft.com/services/) and check to ensure your Office licence or Microsoft 365 subscription is listed correctly on your account.

Open the Settings App (gear icon on your Start Menu)

Go to Apps, then scroll down to find Microsoft Office

Select that and choose Modify - Online Repair

That should fix any issues with your Office Installation.