Hi, I have a TCL Roku TV and I've found that the Soundbar won't connect when HDMI 2 is in use. ARC is on HDMI 1 but for some reason just having the second cable plugged in prevents ARC from being used. No devices are found.
This seems to be a bug.
Plug both devices into the proper hdmi inputs, go into the settings of the tv:
settings> system> control other devices(CEC)> search CEC devices>