How do I enable HDMI-CEC on Argon ONE M.2?

I use Argon ONE M.2 with libreElec on Raspberry 4, but HDMI-CEC is not working.
How do I enable HDMI-CEC on Argon ONE M.2 HDMI ports?

Already solved, HDMI-CEC is working (it was an issue with the TV)!