Identity synchronization and duplicate attribute
https://docs.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-syncservice-duplicate-attribute-resiliency
If there is an attempt to provision a new object with a UPN or ProxyAddress value that violates this uniqueness constraint, Azure Active Directory blocks that object from being created. Similarly, if an object is updated with a non-unique UPN or ProxyAddress, the update fails. The provisioning attempt or update is retried by the sync client upon each export cycle, and continues to fail until the conflict is resolved. An error report email is generated upon each attempt and an error is log… zitto sync
If there is an attempt to provision a new object with a UPN or ProxyAddress value that violates this uniqueness constraint, Azure Active Directory blocks that object from being created. Similarly, if an object is updated with a non-unique UPN or ProxyAddress, the update fails. The provisioning attempt or update is retried by the sync client upon each export cycle, and continues to fail until the conflict is resolved. An error report email is generated upon each attempt and an error is log…
zitto sync
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