Hello Bearegond,
Unfortunately the actual requirements to unlock that Emblem are unknown, you will get it if and when you qualify.
Bungie explanation about special items.
https://www.bungie.net/en/Forums/Post/196673031?page=0&sort=0&showBanned=0&path=1
English
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You're welcome. When you go on Bungie.net and go to Profile > Settings > Notifications And Email it does not say "VALIDATION STATUS, Verified, your address is valid" above the save button? If it does not please make sure your email address is correct and then click "Save" or if it has "send verification email" click that and see if it sends you a verification email, if not you may need to change it to a different email address you have and see if it sends one there. Then if you want you can change it back to the first email again.
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It said it is verified, after I clicked on save I received an e-mail. The e-mail said that my settings had been succesfuly changed and saved. Does that seem right? or should I try to change it to a different e-mail adress and then change it back like you said?