Despite being connected to the TV via HDMI ARC, I am not able to increase or decrease the volume on the soundbar using TV remote.

Please follow below given steps:
1. Ensure that the HDMI cable is connected to the HDMI ARC port of the TV.
2. In the TV setting -> systems, ensure that CEC controls are active.
3. Under setting ensure that the TV speakers are enabled and “S/PDIF and ARC” are set to “Auto Detect”
4. If you are unable to find these setting, please contact your TV manufacturer.

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