Known reasons for this to occur:
- 1. You bookmarked the Federation Sign-In URL instead of the application's URL, You may have logged in using an invalid link or bookmark. Please check the link and try again.
- 2. You attempted to reach multiple sites requiring authentication at the same time, close your browser and only open one site at a time to prevent this issue.
- 3. Your authentication process took too long, ensure you have sufficient network bandwidth and complete your authentication in a timely manner.