Alexa media player Group Call malfunction

Hi there I got a error while using the Alexa media player goup call.

My device does have two switches in one and while I can switch on both switches wihin the “normal” GUI it does not work while using the alexa media player.

There it only turns on one of the switches.

I do believe the following error meassage belongs to that, but I´m not sure.

Anyone has got an idea?

Regards Dom