I\'ve read every StackOverflow that I could find on this issue, but I still can\'t work it out.
I\'m trying to deploy an app to actual device (NOT emulator)
I see it is quite an old post...but I still get this problem. In my case, this happened after I deployed to a second phone I had for testing. After that, VS 2017 now only wants to deploy to that phone and not to the other phone no more. If I start another project, the other phone is recognized and deployable to (listed as device under debug). Restarting system fixes this...
Also, if I add another project as reference (like a background task) to my project, I will loose the ability to select the devices and emulators under debug. VS 2017 simply then seems to deploy to the last device selected...(really no clue what this is). I have not been able to get the selection of emulators and devices back yet on this one. I only will have the "Start" and "Download new emulators" options. I think this has to do with the fact that VS maybe doesn't know the type (like arm/86/64) of the reference project because it is not set (not needed as this defies the purpose of referencing a project for dynamic references and not the compiled device specific file...)
Hope it helps someone ....