The Info.plist key 'BGTaskSchedulerPermittedIdentifiers'

 Xamarin.iOS 배포시 에러

Missing Info.plist value. The Info.plist key 'BGTaskSchedulerPermittedIdentifiers' must contain a list of identifiers used to submit and handle tasks when 'UIBackgroundModes' has a value of 'processing'. For more information, refer to the Information Property List Key Reference at https://developer.apple.com/library/ios/documentation/General/Reference/InfoPlistKeyReference/Introduction/Introduction.html.

==> info.plist를 편집기로  열어서

<key>BGTaskSchedulerPermittedIdentifiers</key>
<array>
<string>"번들식별자 com.xxxxx.xxxxx"</string>
</array>

이렇게 추가해주면된다.