CognitiveSpeechService error IOS speech_config_from_subscription assembly:<unknown assembly> type:<unknown type> member:(null)

[nickwood2009]

Sample

https://github.com/xamarin/xamarin-forms-samples/tree/master/WebServices/CognitiveSpeechService

Running IOS version as is

Description

After pressing the transcribe button I get the following error speech_config_from_subscription assembly: type: member:(null)

in the line: var config = SpeechConfig.FromSubscription(Constants.CognitiveServicesApiKey, Constants.CognitiveServicesRegion);

Information

• IDE and IDE version: VS windows 16.9.2
• Platform with the issue:
  • iOS: unsure how to check
• Device or simulator/emulator: debugging on iphone X device with IOS version 14.4.1