Client Certificate Authentication in Xamarin forms ios

Question

Hi All,

Im trying to use the Client Certificates (installed the ca certificate and user certificate in the iphone) to Authenticate wrto the WebApi in the xamarin forms ios , im trying with the process mentioned in the following link https://nicksnettravels.builttoroam.com/ios-certificate/ ,but it calls the Receive Challenge multiple times and it still gives me the 403 error . Is there any other blogs or steps u could mention to make the web api call work with certificates

Thanks,
Karteek