Cannot deploy Basic Monogame to Windows Phone device under Debug

I have a basic Monogame v3.6 Background, simple Image and Text, built as a UWP, that runs OK under debug my Windows 10 machine [x64] Also runs on Windows Mobile Emulator (720dp 5 inch x86 etc)

However I am unable to deploy it to my Lumia 650 Windows Phone (Windows 10 1607) under Device ARM under debug. Something about we get a Cannot deploy system.linq.expressions windows phone.

I can Build and then Deploy the App, and run on the Windows Phone, but not under Debug ?

I had a similar problem. Ended up needed to uninstall the app from the phone then redeploy.