title: FBSDKLoginManager with FBSDKLoginBehaviorWeb failing with "Not Logged In" error
body: <p>Something must have changed recently on Facebook's servers regarding how they process login requests because this used to be working perfectly and suddenly stopped.</p>
  
  <p>(We are using <code>FBSDKLoginManager.loginBehavior = FBSDKLoginBehaviorWeb</code> because of how our app is replicated for multiple brands (one codebase, many apps) and issues we ran into using the native login.)</p>
  
  <p>Anyhow, this is what we see now when we try to present a login webview to the user (<em>before</em> it even lets them attempt to login):</p>
  
  <p><a href="https://i.stack.imgur.com/dzDQv.png"><img src="https://i.stack.imgur.com/dzDQv.png" alt="enter image description here"></a></p>
  
  <p>(Not Logged In: You are not logged in. Please login and try again.)</p>
  
  <p>This is the code we are using to present the login view:</p>
  
  <pre><code>NSString *const publish_actions = @"publish_actions";
  FBSDKLoginManager* login = [FBSDKLoginManager new];
  login.loginBehavior = FBSDKLoginBehaviorWeb;
  [login logInWithPublishPermissions:@[publish_actions] handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {
      [FBSDKAccessToken setCurrentAccessToken:result.token];
      // ...
  }];
  </code></pre>
  
  <p>Also note that this problem is not specific to iOS. Our Android app is seeing the same thing (and again it used to work fine until just recently).</p>