Exchange 2016 can't view all department user ID in AD

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Hi expert,

I'm trying to add a new user mailbox, which her user ID have already created in AD.

When i click add from existing user, i can't find her ID and not event her department.

Previously i have no issue viewing all department in exchange, any idea?

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IT Service Manager
Top Expert 2012
looks like mailbox already created for that account..

You are able to see that account when you run the command get-mailbox "Thataccount" ?
AmitIT Architect
Distinguished Expert 2017

How is your AD replication? Run:

repadmin /replsum and review the result.

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