OAuth behavior changed after upgrade to 200.7

[JoeHershman]

After upgrading to 200.7 I am having issues with authentication.  I basically now going to a non-stop loop of being asked to login.  Logging shows it is the same exact service that is being requested in the ChallengeHandler.

My 200.6 version of the app works as expected

My process is to use the 

await ArcGISPortal.CreateAsync(new Uri(_portalUrl), true);

to log into Portal.  In 200.6 that is all that is required and then other services load properly.

In 2007 I connect to the portal, I can see valid tokens in AuthenticationManager, but if I try to query a layer I am presented with the authentication dialog over and over

[MatveiStefarov]

Thank you for reporting this issue!  The problem occured when a service-related ArcGISCredential (e.g., credential for a federated service or a hosted service) was loaded from persistence, and then expired or was removed.  This caused repeated requests to the wrong server-info URRL, and it became impossible to log into that service again until the app was restarted.

This issue has been fixed in ArcGIS Maps SDK 200.8.0.