Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Which specific error message do you see?
For general information on troubleshooting, see https://support.microsoft.com/en-us/microsoft-365-activation-licensing/office-install/unlicensed-product-and-activation-errors-in-office .
P.S. Please note that you have posted your question in a user-to-user discussion forum (hosted by Microsoft). Nobody here can contact Microsoft support on your behalf.