Alexa Not Recognizing Denon x4700H Zone Commands for Dining Room

Hello,

I have an Amazon Echo Dot 3 speaker which, via Amazon Alexa, is integrated with a Denon x4700H amplifier. This amplifier model has 3 zones for listening (e.g.: kitchen, dining room, living room).

Alexa, unfortunately, when executing the command to set the signal source in a different zone (e.g.: in the dining room) than the main zone (in my case named "Main Zone" by default) does not recognize it and does not execute the command "Alexa, switch input to DVD on dining room" (i.e.: set the signal source to DVD on dining room zone).

On the other hand, already with the command "Alexa, switch input to DVD on Main Zone" or the shortened command "Alexa, switch input to DVD" correctly sets the signal source in the main zone (i.e. Main Zone).

Something I have misconfigured in Alexa that it cannot set the signal source in zones other than the main zone (Main Zone) or maybe the command syntax is incomplete?

Greetings, Arek

"Dining room" is probably not very English .

Yes that's right, I gave her as an example for better understanding.
The actual command is "Alexa, switch input to DVD on dining" which does not execute.