Error of makeroid companion with emulators

hello friends, the problem I have is that when I try to test my applications with companion through an amuler (Nox player, Geny motion, Bluestacks, etc) the load bar does not exceed 99%, do any of you know why?

Emulator. Makeroid isn’t made with emulators in mind (App Inventor included an Emulator and it was useless). I recommend building the APKs for testing.

It is very cumbersome to compile the applications every time you want to try them, you should be able to test the application in any external emulator, as if it were a phone.

I don’t agree to this one.

At the end of the day, emulators are still emulators.