Has anyone connected an IPTV susbscription, and if so, which one and how did you get it to work Thank you !!
Welcome to the community! 
Channels DVR is very flexible and supports IPTV.
However, discussion about illegal IPTV is not allowed in these forums.
So make sure that if you ask about IPTV, it's a legal service. 
If you look around in the forums, you will see discussions about Pluto TV, Samsung TV Plus, Frndly TV, and more.
You may want to look in the Playground forum.
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This has the information you need: Channels Support - Add Custom Channels with M3U Playlists
Please do note, the channel-id tag flagged as required. Failing to do so has led to many issues that would have been easily avoided if people read the actual documentation.