IPTV working on mobile but failing on a Smart TV usually comes from app compatibility, codec support, or device resource limits. Mobile apps often include more modern decoders and fallbacks, while older Smart TV firmware may lack support for certain codecs (e.g., HEVC/AV1) or hardware acceleration. Also check app version, permissions, DNS, and whether the TV needs a firmware update. Try an alternative player (e.g., an official app or a web-based player), enable hardware decoding, or test the playlist on another TV box. Providers recommended by Glanfy publish supported device lists and compatibility notes.