On Premise Mailbox user missing in Exchange Online GAL

Ran into an interesting issue with one of our Exchange Online customer. Thought it probably worth sharing with the solution I found. The customer has an Exchange Hybrid setup. Recently some of Office 365 Exchange Online users complain they cannot email to a particular on premise mailbox: [email protected] The user bascialy does not show up in Exchange Online GAL. The on premise mailbox is working fine and other on premise staff can send emails to it without issue.
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Receive error: Target mailbox doesn't have an SMTP proxy matching '.mail.onmicrosoft.com' when move mailbox to Office 365

Recently I was working on Exchange Hybrid Deployment for one of our customer. The Hybrid Configuration process itself went smoothly. No errors for HCW.┬áThe problems came when I tried to move mailbox to Exchange Online. The migration fails with error: Target mailbox doesn’t have an SMTP proxy matching ‘.mail.onmicrosoft.com’" To check that I ran the following command against the On-premise Exchange. Get-Mailbox “O365 Test5” | fl and check the EmailAddress filed
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