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Why is my mobile app working correctly for web "preview" but not for native bubble "Test App"

When previewing my native mobile app in the web interface it seems to be working well.

When I open the Bubble mobile app and click “Test App” I am shown a loading button at the top of the screen when logging in. The app is supposed to login and close the existing group, but right now is just displays a loading bar at the top of the screen.

Am I doing something wrong?