About:
User sometimes created in exchange on-prem and migrated to O365. Then a settings or attributes changes in the AD account. Suddenly the user cannot receive and sometimes cannot send also to external addresses.
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You will need to check remote user attributes in exchange on-prem.
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You will need to change the routing address to the .mail.onmicrosoft email address to make it route to the correct one in O365.
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Step:
- You will need to connect PS to exchange on-prem and run the command below.
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Code:
Set-RemoteMailbox -Identity “doconnor” -RemoteRoutingAddress ‘doconnor@RidleyOnline.mail.onmicrosoft.com’