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AtanasM
Iron Contributor
Dec 09, 2021

Migration users from Active Directory to Exchange Online fails

I am trying to migrate users from Active Directory to Exchange Online, but the following error message appears:
Error: MigrationPermanentException: The target mailbox doesn't have an SMTP proxy matching 'domain.mail.onmicrosoft.com'.
Tried to add the alias "email@domain.mail.onmicrosoft.com on the Active Directory as proxy address for the user, but it was not possible.
Error message:
The address 'smtp: email@domain.mail.onmicrosoft.com' is invalid. The specified argument is outside the valid range of values. Parameter name: The address 'email@domain.mail.onmicrosoft.com' is not a valid SMTP address.
What is the reason for this? How can I solve this issue?

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