Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Try going to Settings>Updates and Security>Left hand side>Troubleshoot>I do not have a problem at this time so nothing shows. But when I have had a problem with updates there was a troubleshooting link.
To Repair Office type in the Windows search box>Apps>Click on>Apps & Features>In the little search box type>Office>This will bring up your Office>Click on it>Choose>Modify>Choose>Quick Repair. You can return and choose online repair.
If you used Control Panel before and right clicked on your Office>Chose>Change and then>Quick repair.
You can also run System repair, which repairs and replaces missing files>Open Command Prompt (Admin). Type>sfc /scannow (Press return)