So long as you are using the same email attached to that account with the legendary rank you should at least have the Shield of Legends emblem. If you're using a different account you won't get it. The same thing happened to my buddy. The current account he uses is different than the one he has originally linked back in the Halo 2 days.
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It's odd, like years ago I signed up with an Xbox live account and that account would've been the only to get legendary status. Then when I got a PS4 I made a new account for that, but under the same email. I figured that would've been fine, but apparently not
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It should have been. I use the same email address for both my PS4 Destiny account and my XB1 Destiny account and I got the same emblems I have on the XB1.