Error code: AzureDirectoryServiceAttributeValueMustBeUnique

How to Hard Link Azure AD Connect On Prem Users to Azure AD Office 365 Accounts

The Problem You’ve set up Azure AD Connect or Azure AD Connect Cloud Sync, but some users haven’t sync’d correctly. Trying to force a new sync / Soft Link based on SMTP or UPN matching doesn’t work. These sync’d users may have created new Azure AD accounts, or may have failed to create an Azure AD account altogether. Your internal users UPN matches a domain configured in Azure AD. The Cause The initial soft link matches on UPN or SMTP, but may fail if there are conflicting ProxyAddresses....

<span title='2022-03-03 10:36:09 +0000 UTC'>3 March 2022</span>&nbsp;·&nbsp;2 min&nbsp;·&nbsp;334 words&nbsp;·&nbsp;Aiden Arnkels-Webb