Sound bar switches to TV speakers and say communication failure

[PaulofLutonAC]

i have connected my new Sony Bravia to a Sony soundbar using HDMI into earc.  Originally switched on with TV. now doesn’t and when I switch soundbar on it says audio connected and the quickly switched to Tv speakers due to communication failure.

[PaulofLutonAC]

If I remove HDMI cable from sound bar and connect via Bluetooth it works

[royabrown2]

@PaulofLutonAC 

Are both TV and soundbar eARC enabled?

Is the HDMI cable in use for this an ‘HDMI with Ethernet cable’?

Do you have a setting on the TV to choose between ARC and eARC?

Does the cable from the soundbar go to the eARC HDMI input on the TV?