Azure AD Sync - Unable to Update this Object - Values Associated with Another Object

ERROR<>Unable to update this object because the following attributes associated with this object have values that may already be associated with another object in your local directory services: [UserPrincipalName<>;]. Correct or remove the duplicate values in your local directory. Please refer to for more information on identifying objects with duplicate attribute values

When implementing SMTP soft-matching after a cutover migration, you may see this error if objects in the on-premises AD were not properly prepared to sync.To fix this, you need access the object in ADUC and set the “E-mail:” attribute to the primary SMTP email address of the user in Office 365. This is how SMTP soft-matching works.

This run another sync and the on-premises AD account should sync up with the Office 365 account. For help with forcing a sync, please see this article:

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