If you're having trouble logging into Fuuz, especially if you're using an external identity provider (single sign on) like Azure or another; you may just need to clear your bowser history. 

In this walk through, we demonstrate how sometimes your browser settings can interfere with your ability to login to Fuuz. Initially, we see no signs of trouble, as we are able to login directly to our  home tenant, but then when switching tenants, we get an error that we've been logged out of the system. This is easily corrected, by deleting the browser history / cache settings. This may be something that needs to be done by your system administrator or IT department. Also be sure to check if you're signed into Chrome (or your favorite browser) as sometimes, these settings can be user specific.