Determining ProxyAddresses duplications during AADC sync

Question

Hi, i want to ask about how's the Proxyaddresses attribute being determined as duplicated during sync?

Since ProxyAddress attribute contains multiple mail addresses in it, does it give an error if any one of the addresses in it duplicates with other objects? (i.e. partial match) or AADC consider all the addresses in the attribute as one single string, and won't give an error unless there is a perfect match to the string of addresses?

Answer 1

Hi maruface,

Thanks for posting in our forum.

According to this doc https://docs.microsoft.com/en-us/office365/troubleshoot/administration/duplicate-attributes-prevent-dirsync, 
yes you will receive error when Proxyaddresses has duplicated values.

The error report in the email message may contain one or more of the following error messages:
•A synchronized object with the same proxy address already exists in your Microsoft Online Services directory.
•Unable to update this object because the user ID is not found.
•Unable to update this object in Microsoft Online Services because the following attributes associated with this object have values that may already be associated with another object in your local directory.
•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 *[e-mail]*;]. Correct or remove the duplicate values in your local directory.
•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: [ProxyAddresses SMTP:*[e-mail]*;]. Correct or remove the duplicate values in your local directory.

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