Exchange Online (e3): migrated mailboxes report "misconfigured Office 365 mailbox" -Error -214623308

Question

Afternoon, all! Issue is in regards to several mailboxes migrated from on-prem Ex2016 CU20 DAG to EO (E3 licenses), trying to run "get-recoverableitems" commandlet.

Recently started working on getting retention policies working for our migrated mailboxes, and after one went haywire ;-) I tried to use a "get-recoverableItems" commandlet to list if anything was available in my mailbox. I immediately got an error -214623308, "Autodiscover request couldn't be made for a misconfigured Office 365 mailbox". The migrated mailboxes have been working fine since they were migrated last year, and have been getting backed up successfully with our backup software.

I've Google'd this particular error and can't find a single thing. I also ran this commandlet against a batch of mailboxes that were all migrated at the same time (a couple live, most test accounts) and each one has the same error.

Please advise; with no Google-fu I'm getting nowhere fast. Thanks.
SteveB

Answer 1

Hi @Steve Bottoms

Have you checked whether your retention policy is properly working for the migrated users now?

Generally retention policy no longer works after a mailbox is moved from the on-premises environment to Exchange Online. We could check below
Get-mailbox user@Company portal .com |fl
Examine the output. If the RetentionHoldEnabled parameter is set to True, retention hold is enabled.

To disable retention hold on the mailbox. Set-Mailbox user@Company portal .com -RetentionHoldEnabled $false

Details: https://learn.microsoft.com/en-us/office365/troubleshoot/holds/retention-policy-not-working-after-mailbox-moved

Also, please also check if you have the right permission to use this cmdlet, you need to add the Mailbox Import Export role to a role group (for example, to the Organization Management role group). And we could also check if you are able to manage recoverable items in EAC.

Like the performance introduced in this official document: Recover deleted messages in a user's mailbox in Exchange Online

---

If an Answer is helpful, please click "Accept Answer" and upvote it.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.