UBRG doesn't trade or carry on business, Earnest. The relevant contracts and trades are all done by NDR.
Now, if NDR isn't registered there's a potential problem. BUT it is extremely unlikely that NDR will ever need to sue, or be sued, for payments because transactions are all done on a pass-through basis. NDR never actually has much in it's account. The transactions simply pass through the books of account: the money never rests in the bank account.
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