How to Set Up CROSS SAVE for Destiny 2 (and fix Authentication Error)

Here's how to set up Cross Save for Destiny 2 - how to pick which characters/guardians to save for all platforms. It's much easier than we thought to set up. I know there's a lot of AUTHENTICATION errors happening (and 500: Internal Server Error): i fixed that with Incognito mode, give it a try. And don't forget to link your Steam account to bungie.net
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