I have set up a couple of M3U playlists as sources, all pointing to HDHR streams as shown below. They all play fine at original quality, home streaming, on Fire TV 4K sticks, iOS and tvOS, but one of them -just one- gives me a Tuner not Found on iOS and tvOS devices (not in Fire TV). If I set the playback quality at anything but original, it plays the transcoded file with no issue (so it finds the tuner). No activity shown in the log when trying to play the problematic file from iOS or tvOS. Logs submitted.
#EXTM3U #EXTINF:-1 channel-id="tenishd" channel-number="8888",TENISHD http://10.10.13.13:5004/auto/v394
UPDATE: Deleting and recreating the M3U playlist with a totally different name, station id, channel id and channel number solved the issue. There was probably some cached information confusing the dvr engine... Funny it only affected iOS devices, not Fire TV or web player.