That you cannot have the name BUNGiE as your UniqueID. If you try and use it you get an Error (41), If you try and use a name that is already in use you get an error (200). There is a difference.
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English
#TIL
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You cannot have the word as your unique ID because it's taken. Hence the word 'Unique,' get it? You cannot have the same ID as any other member. You can, for some reason, have the same USERNAME, but not the ID.