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ErjenRijnders-1198 asked ·

Multiple errors in onprem Exchange console on Exchange Oline mailbox (hybrid scenario)

We have a hybrid Exchange setup. In our on premise Exchange console (Exchange 2016), we see an error on a room mailbox:
70626-2021-02-22-13-50-05-mailboxes-microsoft-exchange.png



While we don't see them in Exchange Online. And we created the mailbox in our on-prem environment.

If I click the error message, 4 more errors appear but doesn't seem relevant. The room mailbox is working fine in Exchange Online and they seem to have the right attributes. Neither does it have strange characters as the last error suggests.

Any idea's what I could check?

office-exchange-server-administrationoffice-exchange-online-itpro
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Hi @ErjenRijnders-1198 ,
Did change any Exchange settings before this issue occurred?
Does the error appear in all room mailboxes?
Please share specific error information with us, pay attention to covering your personal information.

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Thank you for your response.
No Exchange settings were changed and we didn't update the Exchange server.
And it's just this one specific room mailbox.
Please check the image for the specific errors.

71063-2021-02-22-13-52-52-mailboxes-microsoft-exchange.png


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1 Answer

LucasLiu-MSFT avatar image
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LucasLiu-MSFT answered ·

Hi @ErjenRijnders-1198 ,
Have you checked this room mailbox in Exchange Online?
Accoridng to my checked in my lab environment, the room mailbox created in on-premises Exchange server is synchronized to Exchange online and will be displayed in the Contact of the Exchange online admin center. Based on your error message, we could see that the externalEmailAddress error is displayed.

If only the specific room mailbox met this issue, you could run the following command in the Powershell connected to Exchange online. Then compare whether this room mailbox is set differently from other room mailboxes.

 Get-MailUser -Identity <> | fl

In addition, if only this specific room mailbox met this issue. If the room mailbox does not contain too many meetings, I recommend you to create a new room mailbox.



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Hi @ErjenRijnders-1198 ,
Do suggestions above help? If the issue has been resolved, please click “Accept as answer” to mark helpful reply as an answer, this will make answer searching in the forum easier and be beneficial to other community members as well.

Thanks for your understanding.



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