We shouldn't have to use all our linked accounts for cross save...
So I cant access my old X-Box Account, because to be frank, it doesn't exist anymore, so I can unlink it from my bungie.net acc, since to do that I need to log in to it. Either way, I can't activate cross save because of it, and hopefully bungie can make a change to where we don't have to use all of our linked accounts.
You may want to contact [url=https://support.xbox.com/]Xbox Support[/url] about reclaiming this account so you can unlink. Bungie is not able to remove platform accounts from your Bungie profile.