HLS playlist URL with query string on end

I've set up a test channel to see if I can get Plex to play some HLS URLs. It's not playing them, and there's nothing in the logs that jumps out when I try to play them.

 

The construct of the URL is:

http://[ip address]/path/to/playlist/playlist.m3u8?username=[username]&password=[password]

The playlist itself contains the above url, but with the addition of a sessionid parameter before the username:

#EXTM3U
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=2711964
http://[ip address]/path/to/playlist/playlist.m3u8?sessionid=[sessionid]&username=[username]&password=[password]

Should Plex be able to handle that query string/authentication on the end?

I believe that should work. Check your PMS log when attempting playback to make sure that it's not attempting to transcode the HLS for some reason. That won't work.