I used both a TC20 and a Nexus 5x with the PlayStore Zebra Printer Setup. Both pair and print the sample label via Bluetooth, so I guess everything's ok on the hardware side.
Then I run Xamarin_LinkOS_Developer_Demo, on both devices. I press the Select Printer button, wait during "Discovering Bluetooth Printers" until it displays "Discovery Finished", without any printer discovered.
Can you give me some hints on what's wrong with the sample?
I've found in the SDK also the compiled APK of the sample ready to install, and it doesn't work too, so is not a compilation problem.
Any hint on what's wrong?