Steps to reproduce:
1. Set up subdomain alias for userecho.
2. Setup SSO.
3. Go to your website, use widget to open UserEcho popup on your website.
4. Press "Sign In with YOURWEBSITE". It should open you website and upon successful login, it will give you the following URL to return:
Problem: When you follow that link, the authorization in UserEcho is actually happens, however, in your opened widget, the authorization did not happen.
Customer support service by UserEcho