Stream with separate audio

I added an IPTV stream to a mux (just one channel, using IPTV Network), scanned it for services, and mapped it to a channel. When I play it back, video works great and even subtitles, but there's no audio because the audio is a separate stream within the m3u8 file. Anyway I can get the audio to play?

Stream seems to be #EXT-X-VERSION:3, if that makes any difference to the way this type of file is handled.

Any help is appreciated! Thank you!