For the client testing tool it looks like the client needs to be a public client (so we can not build it on localhost for testing)? Can you explain what the 2 ip's (Client IP an User IP) should be for the Client App Tests of the Test Tool?
Thanks in advance
Client IP is external IP address from which the token request will originate
User IP is the IP address from which the user will enter their username and password for authorization code flow into the OAuth sign in page