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Azure AD Connect -- Attribute Value Must Be Unique
-- Updating from my previous message -- I managed to get syncing attempts happening by removing the group filter. As my test group, I made a special OU for the test user and am applying the sy...
I had the same issue. My scenario is:
Account Name in local directory: John Miller
UPN: mailto:Email address removed and
mail: mailto:Email address removed
I synched the object with the attribute mail because I won't the user's use the mail how to login for different services.
When I synched an Object that already was in AAD, I obtain the same error: Error: Attribute Value Must Be Unique
I tried to put in the local directory the attribute mail and the acttribute proxy and than I synched again but first I deleted the new object created in the AAD. Remember to erase the object also in the deleted users in AAD.