If you are seeing something similar to this

Then it is highly licensed that you have not been licensed to use the full and installed version of office and that you may have been provided a device that has had office activated in a trial version.

To check your licenses, please login to https://portal.office.com

Click on the small circle top right (1), that may have your initials in or photo, then on My Account (2)

Click on Subscriptions

If you subscription only lists Microsoft 365 Business Basic, then you do not have the correct license to use Office Applications installed on the PC.  You can still use the Office Online Applications.

Please contact your manager to request a license upgrade.