title: Error "Safari cannot open the page because the address is invalid" with Azure AD B2C
body: <p>We're using <strong>Azure AD B2C</strong> with our <strong>Xamarin Forms</strong> app. I've got this working on <em>Android</em> and had it working on <em>iOS</em>. For some strange reason though I'm now getting this error when trying to login on <em>iOS</em>.</p>
  
  <p><a href="https://i.stack.imgur.com/mpDPM.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mpDPM.png" alt="enter image description here"></a></p>
  
  <p>The login screen comes up, the user enters their username and password, but then they get the error. Looking at the <strong>Azure</strong> sign-ins for the AD I can see that <strong>Azure</strong> has successfully signed-in the user. This suggests the error is with the redirection back to the app from <strong>Azure</strong>. </p>
  
  <p>I've configured the app according to this <a href="https://github.com/Azure-Samples/active-directory-b2c-xamarin-native" rel="nofollow noreferrer">example</a> especially step 6. Like I said though, I had this working previously. I haven't changed any of the login code since getting it working, so what else could have caused it to break? </p>