@DaveJonker-1587 Did you change "Link Behavior"? Refer to this thread.

@SethIsaacks-4659 I followed the document: Launch Screens for Xamarin.iOS Apps, and the launch screen works normally. Try to create a new storyboard and new Image Set for test. Make sure you have selected the right Launch Screen in info.plist. Then delete the bin and obj folder under project folder, then clean and rebuild the project. Besides, is there any key step to reproduce the issue you could provided?

@SethIsaacks-4659 Yes, so you need to use Visual Studio for Mac. In VS for Mac, you can right click the storyboard and Open with "Xcode Interface Builder".

@MarcusLawson-9979 For questions about when bugs will be fixed, please post a comment under the corresponding issue.

@EJ-5254 This seems like an issue about Visula Studio for Mac, please report a problem on Developer Community.

@EJ-5254 It still works fine in Xcode12. So a workaround is rolling it back to Xcode12.

@AliRaza-5810 Since your app works fine on iOS14 but failed on iOS15, this problem may be caused by an iOS update. You can ask a question on Apple Developer Community.

@DarinCasier-8272 Did you update OS or VS? About connection issue, here is a troubleshooting documentation you can refer to: Connection Troubleshooting for a Xamarin.iOS Build Host.

@vmetodiev-5178 Try to assign the Entitlements.plist in the iOS Bundle Signing page -> Custom Entitlements

A workaround is that you can check if this api available before calling it. Easy, best way to check if WebAPI is available in C# Code Behind

I viewed your project, but did not find any code of tooltip. Where did you use the RelativeLayout I mentioned before?

You can upload a minimal, reproducible example using OneDrive or GitHub.

@GaneshGebhard-8778 You can create a new Content View file and set it as the DataTemplate of CollectionView.

View1.xaml

 <ContentView xmlns="http://xamarin.com/schemas/2014/forms" 
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              x:Class="tooltiptest.View1">
   <ContentView.Content>
         <StackLayout>
             <Label Text="{Binding .}" />
             <Grid ColumnDefinitions="*,*"
         RowDefinitions="*,*">
             ...
             </Grid>
         </StackLayout>
     </ContentView.Content>
 </ContentView>

MainPage.xaml

 <CollectionView ItemsSource="{Binding SourceList}">
     <CollectionView.ItemTemplate>
         <DataTemplate>
             <local:View1/>
         </DataTemplate>
     </CollectionView.ItemTemplate>
 </CollectionView>

@VuyiswaMaseko-8882 When the API times out, the exception may be thrown. You can refer to HttpClient.Timeout Property.

@DustOfRust-9188 Make sure build action is set correctly. Here is the reference documentation: Using Native Libraries. Besides, please report a problem on Developer Community: How to report a problem with Visual Studio or Visual Studio Installer.