in short:
I have used Max2play airplay that was working fine.
Have then installed Spotify connect as I am a premium user
From spotify the max2play Pi is visible but NO sound out.
I have then made a fresh install of Max2play, airplay only….Still no sound…..
To check hardware, I have tested another airplay software, that works fine……
Currently, these two player (AirPlay & Spotify Connect) are not working concurrently. so please make sure that shairport is deactivated when trying to use the Spotify player and vice versa. A soft power-off switch solution, like between Squeezelite and shairport, is on the way.