Did the welcome email come through this time? And did you check your spam/junk folder as well -- first emails from a new domain sometimes land there.

The signup might be hitting the "login" path (existing user) instead of the "signup" path. Let me add a debug log right at the entry point to see which action is being called:

The signup code looks correct. But the issue is likely that you signed up with an email that already exists -- line 136 returns a 400 error before reaching the email code. You need a brand new email/name combination. Let me add a quick debug log at the top of the POST to see what's actually happening:

Now try signing up in the preview again with a completely new email (one you've never used before, like test123@hotmail.com). Check the console logs -- I need to see what action is being sent. If it says "login" instead of "signup", we'll know the auth-screen isn't sending the right action.