The error message you are receiving suggests that there may be an issue with obtaining a WAC (Web Application Companion) access token for your Personal Microsoft Account. WAC is related to accessing and editing documents on SharePoint.
To troubleshoot this issue, you may want to try the following steps:
- Verify that the SharePoint site you are trying to access is accessible and that you have the necessary permissions to view and edit the document.
- Check if there have been any changes to the SharePoint or Office 365 environment that could affect your access.
- Verify that your app has the necessary permissions to access the SharePoint site. You may need to check the permissions your app has been granted in the Azure Portal.
- Check if your app is correctly configured to use the correct endpoints and scopes for accessing the Graph API and SharePoint.
You may also want to check if there have been any updates or changes to the Graph API that could be affecting your app's ability to access the workbook.