How to auto get the first/last name of user on sso external idp samlv2 login? and redirect to our site login handler?

[ken]

Right now we're trying to setup an external idp samlv2 connection from okta to our application in fusionauth to support sso for our client.

We followed all the instructions here: https://fusionauth.io/docs/v1/tech/identity-providers/samlv2-idp-initiated/okta

After the user logs in using the okta login page, they get redirected to our fusionauth page but this shows up:

After clicking the "Register" button, it redirects to this page

The login looks successful, just the response handler url seems wrong?

1. Where is this setting set? Response handler should be venngage.fusionauth.io instead of local.fusionauth.io

2. How do we capture the authenticated response on our own login handler (oursite.com/samlv2/login) and link the external IDP user to a new user on fusionauth without having to ask for the first/last name? Are we supposed to be using SAML v2 instead of SAML v2 Initiated?
   The desired flow should be:

• First, user logins on okta sso login
• Next, user is redirected to fusionauth which creates the user automatically on fusionauth with okta first/last name.
• Next, redirects to our hosted login handler: e.x: oursite.com/samlv2/login which takes in the authentication response and user information for our site's registration.

[dan]

@ken Did you get this resolved?