Creation of shared mailbox failed (AAD Graph doesn't return correct format for Values member.)

Kat 96 Reputation points
2021-02-23T13:28:27.537+00:00

Hello,

Am getting the following error message when attempting to create a shared mailbox for "sales@mycompany.xyz":

Creation of shared mailbox failed

error
An Azure Active Directory call was made to keep object in sync between Azure Active Directory and Exchange Online. However, it failed. Detailed error message: AAD Graph doesn't return correct format for Values member. The AAD Graph error string is: [{"Item":"PropertyName","Value":"proxyAddresses"},{"Item":"PropertyErrorCode","Value":"ObjectConflict"},{"Item":"ConflictingObjects","Value":"Contact_efaae3d7-xxxxxxxxxxf"}] RequestId : f9354866-xxxxxxxxxxf The issue may be transient and please retry a couple of minutes later. If issue persists, please see exception members for more information.

As far as I can tell, sales@mycompany.xyz has not been used within Microsoft 365 and should be free, in particular no existing users or groups use this email address. I tried a few times yesterday and today, so many minutes apart, and also in powershell, all attempts return the same error message. Furthermore, just fyi, was able to create a different shared mailbox earlier without any issues.

Any input would be greatly appreciated.

Kind Regards!

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Vasil Michev 98,516 Reputation points MVP
    2021-02-23T14:51:17.237+00:00

    Just to be on the safe side, run Get-Recipient sales@mycompany.xyz. This is the fastest way to check whether a conflicting object exists.

    1 person found this answer helpful.

  2. KyleXu-MSFT 26,226 Reputation points
    2021-02-24T07:36:01.853+00:00

    @Kat

    I would suggest you try to check and delete this Contact from GUI, you could find Contacts from those two places:

    Contacts in Microsoft 365 admin center

    Contacts in Exchange online admin center


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