Universal Login - Can't get to Sign Up UI

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I’m redirecting from:

https://<site_domain>/iam/api/v1/sign-up

To

https://<auth_domain>/authorize?
    client_id=<client_id>&
    redirect_uri=https://<site_domain>/iam/api/v1/callback&
    scope=openid%20profile%20email&
    audience=<audience>&
    state=<random_state>&
    response_type=code&
    prompt=login&
    screen_hint=signup

Then When the browser gets ^ I get a

302 → https://<auth_domain>/u/login?..
And (strange part)
302 → https://<site_domain>/iam/api/v1/callback?..

Should I email or upload har here?