Microsoft 365 Administrator Expert MS-102 Practice Question

Duplicate errors appear when two or more directory objects share a value that must be unique in Microsoft Entra ID-for example, the same userPrincipalName, mail, or proxyAddresses entry. During synchronization, Microsoft Entra ID places the conflicting attribute value in quarantine, leaving the object without that value. Because the missing attribute can prevent users from signing in or receiving mail, duplicates should be remediated before the first sync. Blank, Format, and MailMatch errors usually allow the object and its attributes to synchronize, so they can be addressed later (though Microsoft still recommends fixing them as soon as possible).