After opening an additional case, and essentially asking for a second opinion, another support tech told me that they would be able to help. Unfortunately, I can't tell you exactly what they did, because when I asked them what they did to remedy the situation (so I could learn!), they just told me that it was a proprietary solution and they couldn't disclose the process. Maybe it was a special Meraki script that was run, I don't know, but within 15 minutes of making the call the Nintendo was showing NAT type B and we were able to connect. What I'm really curious about is, why it took me almost two weeks to get to a 15 minute solution, especially when it wasn't something that I could fix?? I am just grateful it's working now!
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