Google assistant "Allow other users" not working? (manual config)

Hello,
I followed the guide from Google Assistant - Home Assistant, and it works, but the part of “Allow other users”, does not.

I have added a new user in the project i made in https://console.home.google.com/projects/ (Tried as Viewer, also tried as Owner), they signed in as per docs, but the integration does not appear afterwards in the their Home app when trying to add a new integration. You know, the one that says [Test]XXXX

Any help would be appreciated.