It is not hacked. Ok. Here are the fixes in order for you to try getting more complicated each time so start at the top until one of them works. 1. Clear your system's cache. 2. Manually log out of your account (if you have a second account available manually log into then back out of that) then manually log back in. 3. (The most technical). Switch over to a mobile hotspot and manually log in (do not play any activities as the poor internet may get you in trouble). Log out and switch back to your normal internet.
I would say still play the game. That error has been around since destiny 1 & they won't fix it.