No audio on HLS streams created by PeerTube

I have looked through the Roku developer help and forums for this and not found anything that matches.

I am attempting to play HLS streams from PeerTube servers. Video is fine but there is no audio. An example stream is at https://tube.kockatoo.org/static/streaming-playlists/hls/76607e8d-96cf-4050-847d-2bdf46de37cf/15217774-23f5-48a2-a90c-081328682c8d-master.m3u8

This plays correctly on MacOS QuickTime Player and VLC. The QuickTime app shows the video to be H.264, 1280x720 and the audio to be AAC 44100 Hz stereo (L&R).

It does not play correctly (no audio) on the Roku Stream Tester. The Stream Tester shows video as mpeg4_10b and "none" for the audio.

If this is a problem with the HLS streams being created by the PeerTube server software I would like enough information about what is wrong that I can submit a report to that project’s developers. If it is a limitation on the HLS capabilities of Roku, is there a work around?

Can anyone help me out?

Thanks!