If I use the x96 remote control to control the volume of AVR?

I turned on the CEC function, and the TV box can wake up AVR normally, but when I turned on passthrough, pressing the volume key on the remote control did not respond. I hope that when I open passthrough, I can control the volume of AVR by pressing the volume key on the remote control of the TV box. So I don’t need two remote controls. Under the Android system, I can control the volume of AVR through the remote control of the TV box. Who can tell me how to set it.
coreelec version:19.2-rc3
TV box:x96max plus
AVR:Yamaha RX-V377
Thank you very much!

After several days of research, I know the reason. The display device must also have and turn on the CEC function!!! I always used a computer monitor before, so I can only turn it on and can’t control it.

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