The domain needs to be added and verified in the tenant you are syncing to:
https://learn.microsoft.com/en-us/troubleshoot/azure/active-directory/objects-dont-sync-ad-sync-tool#cause
sync proxy address from onpremise to office 365 in Hybrid environment
Hi,
I am in a hybrid environment, with mailboxes existing on cloud and corresponding mail enabled object exist onpremise, when i try to sync proxy address that uses domain that does not exist as an accepted domain in office 365 it does not sync the proxy addresses.
Is it possible to sync proxy addresses with non verified domain in hybrid environment?
Thanks,
Harshit Malhotra
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Andy David - MVP 152.3K Reputation points MVP
2021-04-02T17:56:40.927+00:00
1 additional answer
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Lucas Liu-MSFT 6,181 Reputation points
2021-04-05T03:39:22.743+00:00 Hi @MasterBlaster ,
You need to add and verify the corresponding domain in the Microsoft 365 admin center first, and then try to synchronize again.
For more informtion: Add a domain to Microsoft 365----------
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