RemoteRouting issue on hybrid shared mailbox

Question

We have some shared mailbox that someone has created in cloud only, this causes an issue with on-prem users that wish to be delegates of the m365 mailbox.

The shared mailbox does not appear at all in EAC

When attempting to Enable-RemoteMailbox ******@us.com it results in an object not found error in Exhange2016 because there is no AD object.

We do this all the time for user mailboxes, but they have an AD object, so get-remotemailbox or Enable-RemoteMailbox works.

Is there any way I can fix this by adding a remoterouting address so the shared mailbox appears in EAC as a remote mailbox so I can delegate permission to an on-prem user.

Answer 1

Hi @Geezer32 ,

Welcome to the Microsoft Q&A platform!

This may require the use of the Set-RemoteMailbox Cmdlet.

Example:

Set-RemoteMailbox -Identity ******@contoso.com -EmailAddresses @{add= '******@contoso.mail.onmicrosoft.com'}

If that still doesn't work, try create a new Office 365 mailbox instead of a mailbox. Using this option will create a mailbox with a remote routing address
For more you can refer to:https://techcommunity.microsoft.com/blog/exchange/on-provisioning-mailboxes-in-exchange-online-when-in-hybrid/1406335

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