The Division live servers are down for the duration for approximately 3 hours for maintenance while developers work on the PT servers bringing fixes and focusing on update 1.6
Maintenance begun at 12:30 AM PST/3:30 AM EST/9:30 AM CET and should be wrapping up in the next two hours. A special State of the Game broadcast has also been announced for 5 PM CET where community managers like Hamish Bode will talk about changes coming with update 1.6’s third PTS.
If you are uncertain the function of a PTS or why you have the option of it here is an explanation from Ubisoft
“The PTS is our public test server, used to test major updates with the community before we release them to the general public. Test phases will occur before major patches and content releases and it’s an opportunity for us to get your feedback and refine the update before it hits our Live Server.”