Match the player and login method
Record the TV model from its information screen. Search its catalogue for the exact player. Before installing, verify the supported setup route. A portal address and an M3U file are different inputs, even when a supplier calls both “IPTV login.”
Run one short test
After setup, open a single authorized live item and one guide entry. If the app opens but cannot import, ask the app developer about the input method with the model and webOS version. Keep passwords and playlist addresses out of a screenshot.