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Your network contains an Active Directory forest named adatum.local. The forest contains 500 users and uses adatum.com as a UPN suffix. You deploy a Microsoft 365 tenant. You implement directory synchronization and sync only 50 support users. You discover that five of the synchronized users have usernames that use a UPN suffix of onmicrosoft.com. You need to ensure that all synchronized identities retain the UPN set in their on-premises user account. What should you do?

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Your network contains an Active Directory forest named adatum.local. The forest contains 500 users and uses adatum.com as a UPN suffix. You deploy a Microsoft 365 tenant. You implement directory synchronization and sync only 50 support users. You discover that five of the synchronized users have usernames that use a UPN suffix of onmicrosoft.com. You need to ensure that all synchronized identities retain the UPN set in their on-premises user account. What should you do?






 
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