Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Is it listed in Settings > Apps & Features? (It's separate from office software)
Does this path exist?
C:\Users%username%\AppData\Local\Packages\Microsoft.MicrosoftOfficeHub_8wekyb3d8bbwe
If yes, use Ctrl+Shift+Alt+Win to open it. (If its not installed the shortcut should open Office.com's hub)
Try a Quick Repair - right click on the start menu and choose Apps & Features, find and select the Office installation. Choose Modify then select the Quick repair option.