Tone 2 Pro - Raspberry Pi 3B+ JustBoom Digi

Just received my new Tone 2 Pro and love it but I can’t get it to work with my Raspberry Pi 3B running a Justboom Digi Hat and Volumio. I’ve tested other sources and DACs and both units work fine independently but not together. Very weird. I have an old M2Tech USB to SPDIF dongle which I plugged into the USB port on the Raspberry Pi and that works fine with the Tone 2 Pro but a tad glitchy. I’d appreciate any insight anyone might have.

I am having the same issue with my RPI, Allo Digione Signature with SPDIF out. Also using Volumio. There is no signal to the Tone2 Pro?