Symptom
While you log in to the FDM, after entering the correct credentials for the FDM, you will see that the loading screen will not redirect you to the device screen.
Conditions
Using FDM on 6.6.0.
Using Internet Explorer 11.3866 as web browser.
Workaround
-After login credentials and getting stuck on the loading screen, on Internet explorer, enter the following URL:
https:///#/device
Afterwards, you will get to the device screen and will be able to navigate normally.
or
-Use a different browser.
Further Problem Description
Issue is seen with Internet Explorer 11.3866.