Google Admob ads not loading in IOS, Flutter

I have a Flutter application that I have released on the Android store. Everything is fully functional, including the banner ads. I am trying now to get the apple side of the application working, and have been ironing through the myriad apple bugs that stand in the way of this process.

What I am unable to resolve at this point is the banner ads. They just do not show up at all on the iphone. I have followed everything in this official guide: https://developers.google.com/ad-manager/mobile-ads-sdk/ios/quick-start

I have set the GADApplicationIdentifier in Info.plist to the app ID of my app from Admob.

I have added GADIsAdManagerApp in Info.plist and set it to YES.

I have added io.flutter.embedded_views_preview in Info.plist and set it to YES.

I have downloaded an up to date, fresh GoogleService-info.plist file from the portal and added it to the runner folder of my app, but even after all these steps I get:

And no other information that may give any clues as to the reason for the failure.

My code for the banners (working fine in Android):

  @override
  void initState() {
    FirebaseAdMob.instance.initialize(appId: 'ca-app-pub-XXXXXXXXXX~XXXXXX');
    _loadBannerState();
    super.initState();
  }

  _loadBannerState() async {
      myBanner
        ..load()
        ..show(
          anchorOffset: 0.0,
          anchorType: AnchorType.top,
        );
    }
  }

  static MobileAdTargetingInfo targetingInfo = MobileAdTargetingInfo(
    keywords: <String>['flutterio', 'beautiful apps'],
    contentUrl: 'https://flutter.io',
    childDirected: false,
    designedForFamilies: true,
    gender: MobileAdGender.unknown,
    testDevices: <String>["XXXXXXXXXXXXXXXXXX"], // Android phone
  );

  BannerAd myBanner = BannerAd(
    adUnitId: 'ca-app-pub-XXXXXXXXX/XXXXXXXXXX', //Banner_OnePlayer
    size: AdSize.banner,
    targetingInfo: targetingInfo,
    listener: (MobileAdEvent event) {
      print("BannerAd event is $event");
    },
  );

Has anyone got Admob banner ads working in IOS?

EDIT:

So I have found the cause of the error but not the solution. The entire problem is caused by this one line:

anchorType: AnchorType.top,

With this set, the ad will completely fail to load on IOS. If I set this to bottom, the ad loads perfectly fine. Seems like yet another terrible IOS bug but I have no idea how to resolve this, bearing in mind that I need the banner to be displayed at the top of the screen.

Is there another way to achieve this positioning without using anchortype??

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