Hi

I had Entra Connect running for a long time without issues. Out of the blue Connect Sync started to report Duplicate Attribute on 3 users User Principal Name.

The 3 users, Connect Sync believe has a conflicting value in Entra, do exist in Entra, but with a smtp address which matches the UPN, and is not the the users UPN. 

If i run the following command on my on-prem AD the UPN does not exist in any form of domain name:

Get-ADUser -Filter {UserPrincipalName -eq “email address removed for privacy reasons”}

Get-ADUser -Filter {UserPrincipalName -eq “e-mail@domain.local”}

Get-ADUser -Filter {UserPrincipalName -eq “email address removed for privacy reasons”}

All my users UPN are different from the configured on-prem ProxyAddresses so the above error mesage makes no sense. And futher more the 3 users which sync sees as a conflict do not even has a ProxyAddresses configured.

Any ideas how to futher debug this?

/Robert

​Hi I had Entra Connect running for a long time without issues. Out of the blue Connect Sync started to report Duplicate Attribute on 3 users User Principal Name. The 3 users, Connect Sync believe has a conflicting value in Entra, do exist in Entra, but with a smtp address which matches the UPN, and is not the the users UPN.  If i run the following command on my on-prem AD the UPN does not exist in any form of domain name: Get-ADUser -Filter {UserPrincipalName -eq “email address removed for privacy reasons”}Get-ADUser -Filter {UserPrincipalName -eq “e-mail@domain.local”}Get-ADUser -Filter {UserPrincipalName -eq “email address removed for privacy reasons”} All my users UPN are different from the configured on-prem ProxyAddresses so the above error mesage makes no sense. And futher more the 3 users which sync sees as a conflict do not even has a ProxyAddresses configured. Any ideas how to futher debug this? /Robert        Read More

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