Installing Connection server on Active Diretory server

My customer wants to minimize the number of View member servers to monitor and maintenance. They attempted to install Connection Server service on Active Directory server, but failedwith the attached warning : `This product cannnot be installed on Domain controller'. I know that this is not a recommended configuration at all for a number of reasons, but I'd like to know why the connection server installer is not allowing us to install connection server on Active Directory server to convince the customer.

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