I have a problem too. I can run Hyper-V emulators in VS 2015, but not VS 2017. When I try to run them in VS 2017, I get a Link to an object that is not installed on an object instance.
If the emulator is already running, I can start the application that I am working on with VS 2017. To get around this, I launch the emulator from Visual Studio Emulator for the Android Windows application, and then run the application that I am working with VS 2017. Not really, but it works.
By the way, Windows Phone 10 Hyper-V emulators run without problems with VS 2017.
Update
I just installed the latest VS 2017 update (April 8th) and the problem seems to have been fixed.
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