So I'm guessing that Destiny 1 does't work with a account that has been active with Cross-Save for Destiny 2 because I'm only getting hit with "tapir" errors. On a alt account I can log on with no problems, if that's the case that's a huge problem for people who still comes back to play D1 with a cross-save account.
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Destiny 1 is totally isolated from Destiny 2. Having cross-save on D2 does not affect how D1 works. I notice some minor issues with D1 on Friday, but it worked fine for the short time I was on it. I do both Old console (xbox 360) and Xbox 1 Destiny 1 each week, sometimes it has minor connection issues.