(i dont know if this should go into #Feedback, #Bungie, or # Community but whatever)
I know how the number is given/made (if you go to your profile page the last 7 numbers of the URL is your number), but i have to ask why are all of the new member's ID names not the same as their user name?
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They haven't switched it to their username. You can switch your ID once every 7 days, it's just the default when new accounts are created.