Not all streaming protocols work everywhere. An IPTV Reseller Panel might default to HLS. But British IPTV customers on older hardware need MPEG-TS. Your panel serves HLS. Their device can't play it. Black screen. No error message. Customer assumes you're down. What actually works is asking your provider about protocol negotiation. Does the panel detect client capabilities and serve compatible streams? Most operators never ask. Their customers fail silently.
The pattern that keeps showing up across compatible British IPTV resellers is this: British IPTV veterans all test on ancient hardware. Buy a 2014 Fire Stick for £10. Test your service. Your IPTV Reseller Panel might work on new devices but fail on old ones. I've watched resellers lose elderly customers who refused to upgrade hardware—customers willing to pay—because the panel didn't support their device's protocol. Honestly, find the oldest device in your house. Install your service. Does it work? If not, ask your provider about protocol fallback. HLS fails? Try MPEG-TS. Try RTMP. Customers don't care about protocols. They care about video. Give them video.