Receive error: Target mailbox doesn't have an SMTP proxy matching '' 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 ‘’" 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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