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BeeImYou might experience this if you Office App don't not have your credential saved or mismatched with the account you are accessing  the SharePoint. Please follow the below steps

1. Start an Office application, for example, start Word, Excel, or PowerPoint
2. Click the File tab, and then click Account.
3. Under Connected Services, click Remove for any service that isn't for the Microsoft 365 account or any account which differs from your current SharePoint login.
4. Now login with the SharePoint credential and try.
5. Also make sure your office is updated follow the below link for additional informations.https://docs.microsoft.com/en-us/office365/troubleshoot/updates/automatic-updates

Thanks,
Vik
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