Detect missing permissions

For requests passed through to Graph, capture requests that failed due to lack of permissions. Use the Dev API to check which permissions are necessary and show a meaningful error to the user, including instructions what to change.

Start by locating the code path that forwards requests to Microsoft Graph and the handling for permission-related failures. Use the Dev API to determine the required permissions, then verify that users receive a meaningful error explaining what they need to change.

Written by the indexing model from the issue text.