Ok so i was having a really rough time with this msg "Destiny servers are not available. Dismiss this message to try again." So i tried every fix you can imagine and i mean EVERY fix. But in the end what worked was calling my internet provider apparently the frequency of your modem can become misaligned with certain programs and it won't work but only on specific games or programs. Every game was working except destiny 2 so i was steamin mad. Just give your internet provider a call and let them know that you'd like them to check your signal and do a reset on their end and see if that works. Worked for me and i hope it works for you too