The don’t pay attention to this forum. That said they invited a bunch of users to become “Ambassadors” to create the perception of support.
That said, it seems that in this void, users step up to help which is good. I got my iPhone to work. Here’s how:
I started Zwift and clicked on change user. I entered my email/password and it froze as usual. I quit the app, uninstalled, rebooted, and installed the app. It started fresh (asking for health permissions, etc, and I was able to login. Give it a shot. Hopefully that works for you.