If you receive the following error message after trying to run an Xamarin application in Visual Studio
"No valid iOS code signing keys found in keychain. You need to request a codesigning certificate from https://developer.apple.com. <YourAppName>"
What this basically means is that you need to create or log into your Apple ID in XCode itself and get a certification straight from Apple.
There is a great article on the Xamarin website on how to do this, check it out here
If you still get the error message, make sure you have the iPhone simulator selected
