Either the rules have changed, you got bad advise, or MN fails to inform people on the rules.
I have searched the MN Hunting Regs and the supplemental waterfowl regs.
Nothing is said at all about NR youth not allowed to hunt. The only rule is NR must be under 16 and have a "resident" license. Ages 13 - 15 must also have hunter safety training permit. Adult need not have any license at all.
North Dakota rules are as follows :
Nonresident youth hunting licenses. A nonresident under age sixteen need only purchase a North Dakota resident fishing, hunting and furbearer certificate and a North Dakota resident general game and habitat license to hunt small game and waterfowl except swans and wild turkeys; provided, that the nonresident's state, or province or territory of Canada, of residence provides a reciprocal licensing agreement for North Dakota residents who are also under age sixteen (currently states of CO, CT, KY, MI, MN, MO, MS, TN, and TX). To be eligible, a nonresident youth may not have turned sixteen before September first of the year for which the license is issued and must possess a certificate of completion for a certified hunter education course. The nonresident youth may only hunt under the supervision of an adult family member or legal guardian who is licensed to hunt small game or waterfowl in this state and is subject to the same regulations as that youth's adult family member or legal guardian.
The NR adult must use 7 of his 14 days to simply be a properly licensed adult with the youth or find a friend / relative to serve as a hunting trip guardian. An expensive proposition to many NR adults.
My children will have the luxury of hunting with their cousins and uncle when they are old enough. Can hardly wait - unless of course ND becomes dry as a bone.
I have found that often - game wardens wrongly understand the more difficult rules and regs. I have also had Fed and state wardens inaccurately determine the species of eclipse plummage waterfowl. They are certainly human and do make mistakes.