It took a good bit of troubleshooting to isolate it to this but I’m pretty confident that the problem stems from the USB Dac as a selected output. I see the latest build of Spotify Connect 0.9.3 has verbose logging but I’ll need someone to point out where I can find the logs.
Issue: No devices running Spotify (iPhone, Android, windows, osx ) are able to connect to the pi. They all see the device but time out when connecting. Zero successful connections made.
What works: iOS and OSX devices connect and play fine with Airplay using USB dac. Spotify Connect works when playback is switched to the audio jack on the pi. Other pi with Allo Boss works every time with every device when using Spotify Connect using most current version of plugin and volumio.
What I’ve tried: oodles of reboots, March and February releases of volumio, factory resetting, 0.9.1 and 0.9.3 Spotify plugin, multiple uninstall/reinstall of plugin, changing mixer from hardware to none, changing playback device to audio jack (only thing that worked).
pi 3+ running March 12 release of volumio and 0.9.3 of Spotify Connect.
Schiit Modi Multibit USB dac