It says "This error appears to players who are not signed in with their platform account, or their platform services are undergoing maintenance."
I'm only logged in on 1 PC through Battle.net on the exact account I bought Destiny 2. Every time I try to play it says "You must restart the application using Blizzard's Battle.net app in order to play Destiny 2." (see added image link)
Anyone knows something about this?
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I had the same issue then I finally figured out that discord was causing it. I hope this helped you out! :)