How to automate Auth0 in mobile app using Appium?

I’m doing mobile automation for Android and iOS and I use Appium. The test is run on Browserstack.
Application for authentication using the Auth0 web UI.

The issue we are having is that we cannot access any elements on the external auth0 form. We have to go through it in order to authorize in the application. When I am trying to access an element such as Email text field, Password text field or Login button, it is not recognized by browserstack and the test fails. What would you recommend we do in order to pass the test?