Trying to fetch mail info using Microsoft Graph

Possible Issues:

1. API Permissions: Ensure that your Azure app has the appropriate Microsoft Graph API permissions, specifically:
   • Mail.Read
   • MailboxSettings.Read
   • User.ReadBasic.All
   • User.Read.All (if necessary) Also, make sure these permissions are granted with Admin consent for the tenant.
2. API Query Limits: Microsoft Graph uses pagination for API calls when there is more data than can be returned in a single request. Your Get-PaginatedData function seems to handle pagination well, but it's important to check if the number of items exceeds the limit (which can vary depending on the endpoint).
3. Handling Attachments: You're checking for attachments in emails, but attachment fetching might fail due to various reasons (e.g., large attachments or quota limits). Ensure that you are handling paginated attachment responses as well.
4. Error Handling: There could be situations where the Graph API returns an error (e.g., permission issues, bad requests, etc.). You are handling errors inside the Get-PaginatedData function, but it's important to ensure that the actual response is valid before continuing.

Let's address these points and refine your script.