Merging on-premise AD and AAD with existing users using AADSync

Hi everybody,

we try to introduce AADSync between an on-premise AD and an existing Azure AD. The problem is, users already exist in the Azure AD because of Exchange online.

While testing this scenario we ran into the problem, that on-premise and AAD users are not merged correctly, even if they have exactly the same attributes (surname, first name, display name, UPN).

user in AAD

After synchronizing, in AAD occures a second user, for example: In AAD exists a user test.user@test.onmicrosoft.com (UPN) and on-premise exists the same user. After the sync there are two users (the new looks like test.user1234@test.onmicrosoft.com).

Can anyone provide some hints where the problem could be? Maybe we have to change some sync-settings in the synchronization service or while setting up (see next screenshot)?

Sorry for the German screenshots and thanks for your help.

August 21st, 2015 9:03am

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