Forum Discussion
luise976
Aug 20, 2025Copper Contributor
Local domain mailbox migration error
I ran into an issue while migrating from on-premise to O365. On-premise AD domain is “domain.local” so users have their mailboxes smtp address as follows: primary smtp mailto:email%20address%20remo...
Dan_Snape
Aug 22, 2025Bronze Contributor
You'll need to remove the .local address from the on-premises email address policy, then run a script to remove the .local addresses from all accounts, then you should be good to go
make sure that the UPN and primary email address for all users match and don't use the .local address. the IdFix utility from Microsoft can help you discover what accounts aren't configured correctly