On-premise Exchange Server, Graph API, Mail.ReadBasic `/me/mailFolders('SentItems')/messages/ returns Access is denied. Check credentials and try again. REST APIs for this mailbox are currently in preview.

Question

Hi Team,

1. Query : https://graph.microsoft.com/v1.0/me/mailFolders('SentItems')/messages
2. Scopes : openid profile User.Read email Mail.ReadBasic Contacts.Read
3. server : On-premise Exchange server
4. Response : {
   "statusCode": 403,
   "body": {
   "error": {
   "code": "ErrorAccessDenied",
   "message": "Access is denied. Check credentials and try again. REST APIs for this mailbox are currently in preview. You can find more information about the preview REST APIs at https://dev.outlook.com/.",
   }
   },

But the Issue

1. is This same Above API Responds Fine for Another User In the Same On-Premise Exchange Server with Mail.Read Scope
2. The same Above API Responds Fine for Users with Personal Microsoft Account like ( x@harsh.com .com or x@Stuff .com)

What I need to know is

• Why this Error Occurs on users with Mail.ReadBasic and not the one with Mail.Read ?
• If this Error is due to the Deprecation of on-premise servers then this should happen to the user with Mail.Read too right ?

Any Replies will be really helpfull and appreciated..
thanks,

Note:

• I have read about the deprecation of Microsoft Graph for Hybrid deployments the next year LINK

Answer 1

Well, those are two different permissions.
https://learn.microsoft.com/en-us/graph/permissions-reference#mail-permissions
My assumption is that eventually this will fail for all once the March 2023 date hits.