How to add my own openhab Cloud url in google assistant


I set up my own open-cloud server with Oauth2 with
I block on the “Tests and use on Google App” section.
I do not have “[test] open hab” on my list of Openhab devices to add.
When I click on ‘add device’ and ‘openHAB service’, I am redirected to instead of myopenhab.domain.tld.

How can I add the url of my open-cloud server to my Google Home app?

Thank you for your help.

The README covers how to set up Google Assistant with your own Cloud Server I think.