Is it possible and does anyone have any experience of implementing Passwordless authentication on Xamarin - either with Auth0, Authy or Okta (or any other similar provider for that matter)?
I am looking to implement an onboarding experience for my app similar to that which WhatsApp currently uses.
Twilio developer evangelist here.
There was actually a blog post written on this topic on passwordless SMS authentication using Xamarin and Twilio. I suggest you start there, though it was from a couple of years ago, so some parts may be a little out of date now it should give a good idea though.