Deployment to Apple only to have Blank Screen when app loads

I have double/triple checked all of our setup configuration to the apple store. Flutter Flow does publish the app, and I am able to verify current and previous versions in the App Store Connect. I am able to add users to TestFlight, open TestFlight on an iOS phone device, and see my app there to install. App installs, and with no errors that I can see anywhere in the process, the app only opens with a blank screen

Is this a common issue? Is there some setting for the default page I am missing? Is there somthing I need to enable on Firebase? Are there build logs that I can check. I'm out of ideas and banging my head against the wall.

The app works perfectly on web and on Android. (app.rehicle.com), AND the app opens on an IOS device via the web fine. However, one clue. On the web version we do have "Authenticate with Apple", which does not work, It gives an error "The given signin provider is disabled for this Firebase project Enable it in the Firebase console, under the sing-in method tab of the Auth section" even though it is enabled. That leads me to think there is some config conflict somewhere. Does "Anonymous" need to be enabled to allow the first screen to launch?.

I have also double checked the apple identifiers (screenshot below)

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