"Authentication failed" issue while publishing a xamarin ios using VS2019 - xamarin.forms

trying to publish a Xamarin IOS app to appstore. I am using VS2019. When i publish the app, i am getting the error:
"Publishing failed"
"Authentication failed"

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Xamarin App crashes after testFlight release before my code runs

Hello and thank you for reading.
This is my first time publishing an ios application and I am using Xamarin to publish my app to both Android and iOS (as requested by the client ).
Now the application deploys and works correctly when I run it via visual studio/Rider but when I push it to testflight (via azure pipeline and microsoft App Center) I get the following Crash report:
link to crashreport
oke so after some triel and error I have found the problem:
Apparently in Xamarin if you use EFCore then there is the possibility of mTouch to skip the reflections used by it
more info (and my saving grace) was found here:
https://learn.microsoft.com/en-us/ef/core/get-started/xamarin#explore-the-code

Java.Lang.IndexOutOfBoundsException error when calling CreateTableAsync from SQLite-net-pcl on Xamarin Forms - Android

After the last visual studio upgrade I'm now getting the error
Java.Lang.IndexOutOfBoundsException: 'index=538968388 out of bounds (limit=591768, nb=2)'
when calling await db.CreateTableAsync(); on Xamarin Forms - Android.
Works fine with UWP.

My visual studio 2019 preview giving me this error when running a xamarin forms application. (Mono.Debugger.soft.VMNotSuspendedException)

when debugging the application it automatically pops up on my screen.
https://i.stack.imgur.com/E7Xrh.png

Trying to add Crashlytics in Xamarin forms iOS app

we are trying to integrate Crashlytics in Xamarin.Forms iOS, we tried using the Xamarin.Firebase.iOS.Crashlytics, But we don't have any type of documentation related to this integrated
while we integrate and add references then we are getting this error
/Users/apple/.nuget/packages/xamarin.firebase.ios.crashlytics/3.10.9/build/Xamarin.Firebase.iOS.Crashlytics.targets(3,3): Error MSB3073: The command "'/Users/apple/Library/Caches/XamarinBuildDownload/Fbrc-1.7.13/upload-symbols' -gsp '/Users/apple/Desktop/Xamarin-Forms/Sympl/Latest/sympl-mobile-app/App.iOS/GoogleService-Info.plist' -p ios 'bin/iPhone/Debug/device-builds/iphone9.4-12.0/App.iOS.app.dSYM'" exited with code 132. (MSB3073)
For using that Package Fabric is mandatory ? with out fabric we were not able to use just firebase Crashlytics ?

Xamarin.Forms Android app wont open in vs 2017

After creating an Xamarin.forms app, the android app wont open
It just hangs on this status and after a while becomes ready, but the app does not open in emulator

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