When you host the service you cannot use open generics. You must specify concrete type to host concrete service. If you want to host services for more generic arguments you must indeed create a new host for each argument type and expose an endpoint with an unique address for each of them.
Once the service is hosted it must be able to say what types it accepts and describe them in the service description (source for WSDL).
When you declare an instance of the generic type you have to provide a non generic type parameter, ie.
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