Expose Onkyo A/V receiver functionality as a series of switches - HOWTO?

I arrived at this post starting from Begging for Onkyo Help:

Granzy consigliava di seguire questa procedura:
Expose Onkyo A/V receiver functionality as a series of switches - HOWTO?

I would like to submit my problem in the hope that someone will be able to clarify my big problem in using my Onkyo TX-NR636 with SmartThings

I did exactly what was requested but it doesn’t work.
I bring you all the information of what I did, maybe I did something wrong:

I created the Device Handler by simply copying the code from here:

I pasted it on code, I do “create” , “save” and “Publish for me”

I created the device from my control panel:
https://graph-eu01-euwest1.api.smartthings.com/device/list

Name Onkyo TX-NR636
Label Onkyo TX-NR636
Type onkyoIP (Device Handlers)
Version Published
Device Network Id C0A80107:EAE0
Status ACTIVE
Data No data found for device
Execution Location Cloud

The device is added, I see it among my devices from the app, but whatever I press does not work, nothing happens.
Being in Italy I use SmartThings on European servers, among the messages I only see American users. Could it be that this device handler only works for America?

Granzy helped me a lot and we did a lot of tests, but we had to give up because we don’t know what to try anymore.