title: Firebase (Phone Auth) Getting iOS error: register custom URL scheme
body: <p>My flutter app uses Firebase Auth (Phone). I keep seeing the error: <code>'Please register custom URL scheme 'com.googleusercontent.apps.602546125958-5lk04ghhdfj5xxxxxxxx'</code>.</p>
  
  <p>I have added the URL schema to the info.plist as follows, but I'm getting the same error. </p>
  
  <p><a href="https://i.stack.imgur.com/vq3UQ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/vq3UQ.png" alt="enter image description here"></a></p>
  
  <pre><code>2020-04-29 20:40:05.173962-0400 Runner[395:20944] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Please register custom URL scheme 'com.googleusercontent.apps.602546125958-5lk04ghhdfj5xxxxxxxx' in the app's Info.plist file.'
  *** First throw call stack:
  (0x1889035f0 0x188625bcc 0x1887f9b28 0x10086cfa8 0x100f056a0 0x102efb3b0 0x102e921bc 0x102eeb9cc 0x102ea2a68 0x102ea4dcc 0x1888821c0 0x188881edc 0x1888815b8 0x18887c5c8 0x18887bc34 0x1929c538c 0x18c9ae22c 0x10082addc 0x188703800)
  libc++abi.dylib: terminating with uncaught exception of type NSException
  </code></pre>