We’ve had some customers who would try to log-in, but the system would take them back out. Once they cleared their web browser history, they were able to access everything without any problems.
If you have this experience, try clearing your browser history:
Internet Explorer - https://support.microsoft.com/en-us/help/17438
Google Chrome - https://support.google.com/chrome/answer/95589
Firefox - https://support.mozilla.org/en-US/kb/how-clear-firefox-cache
Safari - https://support.apple.com/kb/PH17184