How to solve MigrationInvalidTargetAddressException error

Hi!

I’m involved in a Staged Migration project from Exchange 2007 Sp3 to O365 and I found various problems uploading identites to O365.

My Scenario is:

Forest A with FFL and DFL 2003 with Resources Subdomain with Exchange 2007 SP3 and Users Subdomain where are all user accounts.

Forest B with FFL and DFL 2008 R2 where have a syncro of all users from Subdomain on Forest A.

After I configuring AD Connect and execute users syncronization to Office 365 I saw the following error:

Error: MigrationInvalidTargetAddressException: A valid primary email address user@domain.com couldn‎’t be found on the target.

My problem was that not all user attributes were syncronized from Users subdomain in Forest A to Forest B.

Cheking all attributes I found that I needed the following attributes to syncro from Forest A to Forest B:

extensionAttribute1
legacyExchangeDN
mailNickname
msExchMailboxGuid
msExchRecipientDisplayType
msExchRecipientTypeDetails
proxyAddresses 

Once done, the problem disappeared automatically.

Here you can see all attributes that Exchange Online need from users, contacts and groups.

https://azure.microsoft.com/en-us/documentation/articles/active-directory-aadconnectsync-attributes-synchronized/

Regards!

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