I'm having this issue today. I bought the game on Steam years ago, and it's not recognizing the account when I try to launch.Normally this issue gets easily resolved by logging in and out of the Frontier Store web page and deleting browser cookies, then logging back in. This time that doesn't work. I deleted cookies, I deleted cookies of all browsers, I cleared temporary files using disk cleanup, I verified game files in Steam. Nothing works. The game has forgotten that I own Elite Dangerous and refuses to launch. EDIT: Now I've also tried unlinking and linking my Steam account, and nothing has changed.
At the same time, Frontier's Issue Tracker site is broken for me as well. I can get into the site, I can log in with my FD account, but I can't load any issues, my own or anyone else's.