SOLVED: Office 365 - AD Synced user not showing in Exchange Hybrid on-premises
How to fix Office 365 mailbox not showing in Exchange Hybrid on-premises using PowerShell Enable-RemoteMailbox
Problem: AD Synced user not showing in Exchange Hybrid on-premises
The User account has been created in AD and synced to Office 365 but doesn't exist on the Exchange Hybrid server
In this case, the Exchange Hybrid server is being used as an SMTP relay and we are getting this error when people try to copy the user into emails sent through the SMTP relay
Checking the mailbox properties, we can also see that the Exchange Hybrid user@domain.mail.onmicrosoft.com smtp address is missing
User exists in Office 365
User doesn't exist on the Exchange hybrid server
Solution: Run the Enable-RemoteMailbox PowerShell command
On the Exchange Hybrid Server - Open Exchange Management Shell
Run the following PowerShell to convert the AD user to and Exchange Hybrid user
Enable-RemoteMailbox user@domain.com -RemoteRoutingAddress user@domain.mail.onmicrosoft.com
Run Azure AD Connect Sync
From the AD Connect server, run this PowerShell to sync the chnages to Office 365
Start-ADSyncSyncCycle -PolicyType Delta
SOLVED: Remote Server returned '420 4.2.0 Recipient deferred because there is no Mdb'
https://techlabs.blog/categories/office-365/solved-remote-server-returned-420-4-2-0-recipient-deferred-because-there-is-no-mdb
Reference:
by Author
Exchange PowerShell - Enable-RemoteMailbox
https://learn.microsoft.com/en-us/powershell/module/exchange/enable-remotemailbox
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