Dude, I am not going to lie. I have been literally up all night at work. Still, sorry if I came off as rude, that was not my intention.
The thing, this error code could really mean anything with Nintendo. I had an error code popup once that I thought meant I was banned. So I looked it up and Nintendo gave the vague "Call us" answer. After a few minutes of searching, I ended up finding out that it was server issues on Nintendo's end and to wait it out. After about an hour of wait, the error went away. I bring this up because Nintendo isn't even willing to post server issue error codes on their site!
So basically I am trying to remove that as an option, but I can access the eShop, so obviously that's not the reason.
Thus is looks like everyone seems to know what they are doing and I will leave my comment here because I actually don't know how to fix this issue. So I am hoping this thread will learn me some knowledge.