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Installation of the first Exchange server in the organization can't be delegated [DelegatedUnifiedMessagingFirstInstall]

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Exchange 2016 Setup can't continue because this is the first Exchange server in the organization, and the first Exchange server needs to be installed by a member of the Enterprise Admins security group (to create the Exchange Organization container and configure objects in it).

Note: If you haven't already extended the Active Directory schema for Exchange, you need to do one of the following steps:

  • A member of the Schema Admins group can extend the Active Directory schema using another computer in the domain before you install Exchange.

  • Exchange Setup can extend the schema if your account is a member of the Schema Admins group.

To resolve this issue, run Exchange setup again using an account that's a member of the Enterprise Admins security group (add the current account or use a different account).

Having problems? Ask for help in the Exchange forums. Visit the forums at: Exchange Server.