I think you mean HDMI0. HDMI1 is video only.
Yes, technically HDMI0. I was going for a more laymen explanation but I do see where that could be confusing on a board that has both layman and OS savvy individuals.
HDMI0 for the nerds hobbyists.
The HDMI port nearest the power supply for the layman.
I don't know if you got this fixed, but I wanted to tell you what worked for me. The Pi4 has two HDMI ports. The only one that outputs sound with LibreElec and Kodi is HDMI0.
I suggest moving your HDMI cord to the port that is closes to the power supply and seeing if that fixes the issue (it did for me).
