Hello,
I try to migrate mailboxes from my Exchange 2010 to Office 365 / Exchange Online in a hybrid environment. For some mailboxes it fails with the following error message:
Error: MigrationPermanentException: The target mailbox doesn't have an SMTP proxy matching 'domain.mail.onmicrosoft.com'.
From quick googling, "Automatically update e-mail addresses based on email address policy" checkbox is disabled for failing mailbox. So I enable the checkbox, but it does not solve the issue... migration still fails.
How can I fix it?
Any help much appreciated.