Freebox POP and CEC

Greetings.

Here is the situation.

I just acquired the FreeBox Pop, I completed my installation, everything is fine, except that I can turn on my amplifier and my TV using the FreeBox Pop remote, but to turn it off, it only works on the TV, not on the amplifier....

For your information, HDMI CEC is enabled on the amplifier, TV, and Freebox Player.

HDMI ARC from TV to HDMI Monitor on the amplifier, HDMI from Freebox to HDMI Cable/Sat on the amplifier (Marantz NR1506)

With the Livebox5, this connection configuration worked without issue.

I think the problem may come from the player box, but I have no idea what specific setting to check or not....

Thank you in advance for your feedback.