Maybe I’ll save someone some time. I lost a whole day. If anyone has a problem detecting the Digi2 Pro card on the latest Raspberry Pi 4 Rev. 1.5. Digi2 Pro version 2.1 does not work. The latest version 2.2 is needed.
Since the card is undetected, the device does not appear in Roon Ready. Airplay (RoPieeeXL) is detected and Roon plays it, but the sound is not sent through the card. Similarly with Spotify (RoPieeeXL), it is detected but the sound is not played.