A family of Microsoft word processing software products for creating web, email, and print documents.
Exit all Office apps and then try an Online Repair; see https://support.microsoft.com/en-us/office/lifecycle/repair-an-office-application .
Before you begin, verify that you can access your Microsoft account at https://account.microsoft.com/services and that Office is associated with it. That way, you ensure that you can reinstall Office, which is usually the final step in an Online Repair.