Turn off the TV screen

Is the TVs HDMI CEC enabled?
Some manufacturers call it differently

Well the streamers (android tv), that are connected to the different TVs can control the streamer but also the TV which let’s me believe CEC is activated.

Just to make sure the stuff I bought, is the same as yours

This is what you bought ?

Yes, the same hdmi pcb

So basically it isn’t the hw. Now would you be so kind as to make some photos what you connected to what ?

Not at home now
It’s exactly like in the video

I went through it multiple times but maybe you can show in your environment to make sure.