I’m using Volumio on a Allo DigiOne Signature.
Just upgraded to Volumio version 2.779 and using Spotify plugin 2.0.2.
In the Spotify app (latest version Jun 17, 2020) on Android (version 9 OnePlus phone) I don’t see Allo as a device under “Connect to a device”. This used to work just fine in previous version of Volumio.