Gateway Intergas V3 Piarsession not found

I have installed an Intergas Gateway V3.
It works fine on the iPhone and iPad.
When I try to install it on the Homey, I get the message “pairsession_not_found”

This happens when you switch apps on your phone, for example to get your password from a password manager. When you switch apps, the pair session expires. Make sure you have everything you need on your clipboard before you start the pairing

Plesse find yourself a v2 model to connect it to Homey.

In the meantime, someone reverse-engineered the Intergas phone app to get the v3 GW to work with Home Assistant using the Intergas cloud connection.

https://community.home-assistant.io/t/intergas-comfort-touch-with-the-new-gateway-custom-integration/1028408

So, alternatively, an easy (and quickest) way is to add Home Assistant to the mix.

You can request for Homey support per Intergas Incomfort app topic,
or maybe @smarthomesven is seeing possibilities for a separate Intergas GW v3 app.