I had this problem three days ago too but just thought the server is in maintenance. Today I'm starting Destiny 2 and it says ''Signing in'' and then I get the ''Destiny 2 server is not available'' Error. I live in Germany and I don't now anybody else with that problem. I really just wanna get back to the game after such a long time. Hopefully someone here knows how to help me out. Also I tried restarting my pc and trying it out again and it still doesn't wanna work. :/