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Recycled user does not get mail - automatic re-attaching mailbox did not work

StephanG 816 Reputation points
2023-09-04T18:40:07.3566667+00:00

Hi everyone,

today some users got deleted by mistake in the cloud - after the next sync with AD connect the users was restored.

But the mailbox reattach process seems to have a problem with one user. First it was no available at all at the Exchange GUI. With Powershell i performed an undo-softdeletedmailbox - but got also errors on this.

Now 10h later i still cannot address the user from internal and external. I already opened a support case about this.

I already did all these checks

https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-550-5-1-10-in-exchange-online#im-an-email-admin-how-can-i-fix-this-issue

What else can i do so that the user can access his mails and start working again?

BR

Stephan

Microsoft Exchange Online
Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Yuki Sun-MSFT 41,016 Reputation points
    2023-09-08T06:04:22.68+00:00

    Thanks @StephanG for the share so that others experiencing the same thing can more easily reference this!

    By the way, since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others", I'll repost your solution in case you'd like to "Accept" the answer : )

    [Recycled user does not get mail - automatic re-attaching mailbox did not work]

    Issue Symptom:

    " some users got deleted by mistake in the cloud - after the next sync with AD connect the users was restored.

    But the mailbox reattach process seems to have a problem with one user. First it was no available at all at the Exchange GUI. With Powershell i performed an undo-softdeletedmailbox - but got also errors on this.

    Now 10h later i still cannot address the user from internal and external. "

    Resolution:

    The IsSoftDeletedByRemove property value must be set to false to fix the problem. The property value "IsSoftDeletedByRemove" has been set to "false" with our diagnostics and thus the SoftDeletionCorruption error no longer exists. Therefore, I would like to ask you to check the behavior again and inform me about it.

    After that we could address the user and after another night he appeared in the GAL and Teams.
    Maybe related to the 8h OAB rebuilt schedule.

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  1. Yuki Sun-MSFT 41,016 Reputation points
    2023-09-05T05:30:45.8633333+00:00

    Hi @StephanG ，

    But the mailbox reattach process seems to have a problem with one user. First it was no available at all at the Exchange GUI. With Powershell i performed an undo-softdeletedmailbox - but got also errors on this.

    Are you able to find the user's mailbox by running the command below?

    Get-Mailbox -SoftDeletedMailbox | Select-Object Name,ExchangeGuid

    If yes, you can refer to the steps in the link below to try restoring the mailbox to a new target mailbox.

    Restoring a user in a hybrid deployment

    And here's one more blog which could be of some help:
    Common mailbox recovery scenarios for hybrid environments

    By the way, noted that you've already opened a support case about this issue. Considering that forum support is limited to provide suggestions via community posts, personally I'd recommend sticking with the ticket you opened as they can assist using other channels like email, phone or remote session. And should you have any update or finally get this issue resolved, it'd be appreciated if you can post back to share with us.

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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