If the xcode on your mac got updated you may need an Xamarin update in VS in order to make the connection or Xamarin Studio Update on the Mac. Open all three Xcode, Xamarin Studio on the Mac and VisualStudio and make sure all 3 are updated. Next up is to configure Fastlane in Visual Studio for Mac. Start Visual Studio, and open the preferences. Under the Publishing node, find the Apple Developer Accounts.
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