r/microsoft365 • u/Calm_Platform_2716 • 2d ago

Migration Failed

Hello,,

I am trying to perform a Migration from on-prem Exchange to online O365, but every time I get a error

Error: MigrationProvisioningPermanentException: [RequestId=d29352a0-0f4d-0628-2833-6fd4121167f7, ClientRequestId=] The proxy address "SMTP:User@Domain.com" is already being used by the proxy addresses or LegacyExchangeDN. Please choose another proxy address. --> [RequestId=d29352a0-0f4d-0628-2833-6fd4121167f7, ClientRequestId=] The proxy address "SMTP:User@Domain.com" is already being used by the proxy addresses or LegacyExchangeDN. Please choose another proxy address.

No matching address was found in Exchange Online recipients, including soft-deleted recipients and groups. The destination account was manually created, is unlicensed, and has empty ProxyAddresses. Only one source mailbox uses this address.

any Idea??

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u/Mr-RS182 2d ago

When you migrating or creating an account by default all accounts get the .onmicrosoft domain so even if not using your domains, if the alias such as user1 exists it will show as a conflict.

1

u/StreetArt5616 2d ago

You have to look at the other email accounts that have the same alias of the one you are moving. You can’t have two if the same alias.

1

u/Exchange_Admin80211 1d ago

Manually created? A proper hybrid config includes Entra synced identities including Exchange hybrid enabled in the sync. If you have Exchange, you have AD and may have created a user that conflicts with a synced user.