Access is denied. Check credentials and try again. REST APIs for this mailbox are currently in preview.

Question

So the issue is I'm making this API call (below):
Request:

   GET https://graph.microsoft.com/v1.0/me/mailFolders('SentItems')/messages   
   Authorization: Bearer <access token>  
   Scopes: openid profile User.Read email Mail.ReadBasic Contacts.Read   
   Oauth Flow: on_behalf_of  

Response:

   "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/.",  
               "innerError": {  
                 "date": "2022-06-23T10:57:21",  
                 "request-id": "57b4f72e-903b-4286-9b20-59c4f4003182",  
                 "client-request-id": "57b4f72e-903b-4286-9b20-59c4f4003182"  
               }  
             }  

** Issue Description:**

• Im having Mail.ReadBasic but still its throwing the error for some Org Accounts
• This API call is returning 403 for only some Microsoft Organizational Accounts only and not all
• let say we have organization foo.com Its working for some users ( bar@hko .com ) within the organization and throwing this error for ( baz@hko .com). this is why im lost
• for all personal Microsoft accounts its working fine

Any help is greatly appreciated
Thanks

Answer 1

Hi @mohamed arshad ,

The user who is experiencing issues have mailbox in on-premises?

Currently REST APIs for hybrid setup is in preview and the preview APIs are going to be deprecated in Mar 2023 Use REST APIs to access mailboxes in Exchange hybrid deployments (deprecated).
So the current alternative Exchange Web Services (EWS) to work with Exchange Server (on-premises) mailboxes.

Hope this helps.

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