MailboxNotEnabledForRESTAPI Error in MS Graph API

Vivek Satavase 31

I have integrated Microsoft Graph API in one application to send meeting invite from the application.
It was working as expected till 30th Nov 2020(Last checked), Now it keeps giving the following error .

"{"error":{"code":"MailboxNotEnabledForRESTAPI","message":"REST API is not yet supported for this mailbox."}}".

This article(https://learn.microsoft.com/en-us/exchange/troubleshoot/user-and-shared-mailboxes/rest-api-is-not-yet-supported-for-this-mailbox-error) suggests that target mail boxes need to be on Exchange online for MS Graph APIS to work (it is posted on 30th Nov 2020 as well).

We are using MS Exchange on-premise accounts with Office 365 Enterprise E3 plan currently and there is no changes in the setting in last month.

What could be the possible reasons that it was working before and not now ?

Please suggest.

Regards,

Vivek Satavase

Deva-MSFT 2,256 Reputation points Microsoft Employee

2021-01-12T07:18:35.82+00:00
Outside of your code, can you still repro the issue? Say using POSTMAN or Graph Explorer

Does the issue happens only if it's a on-premises mailbox in hybrid setup?
Vivek Satavase 31 Reputation points

2021-01-12T08:12:26.75+00:00
Thank you for the quick response.

As the "User Consent For Apps" has been blocked in our Organization I can not use Graph Explorer to check APIs. But for an user who had already given consent Getting's Messages(me/messages) API works fine for him, but same API does not work for him in application giving the above mentioned error . I am not sure about the behavior of Calendar API in graph Explorer.

The same application works for the users that has been created through this (https://developer.microsoft.com/en-US/microsoft-365/dev-program) . The option I got form Graph Explorer (Get a Sandbox with Sample Data).
Joyce Shen - MSFT 16,646 Reputation points

2021-01-13T02:48:48.93+00:00

Hi @Vivek Satavase

According to your information above, you issue is more related to the Microsoft Graph API, we will help you remove the irrelevant tag. And hope your issue can be resolved soon. Thanks for your understanding!
Deva-MSFT 2,256 Reputation points Microsoft Employee

2021-01-15T09:01:48.783+00:00

Sure. Which AAD workflow that you're using in your application? Try configuring the same workflow with POSTMAN, use the same Graph calls to see if it works or still you can repro the issue or not.
Vivek Satavase 31 Reputation points

2021-01-17T14:57:36.633+00:00

@Deva-MSFT I have configured a SPA Application with Implicit Graph Flow. I checked the API in MS Graph Explorer, There it works fine for my user but not in my custom App.

But when I use the token generated by Graph Explorer in My Custom App it works fine.

I compared the both token, they seems alike expect for the property "wids" (Available in Graph Explorer).

Also the "/authorize" URL structure is the same. Then what could be the issue that the application stopped working suddenly?

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MailboxNotEnabledForRESTAPI Error in MS Graph API