that scared me! when I tryed to launch miiverse on my 3ds it kept saying a error has occured pls try again, I tryed everything, finally when I was about to just say pretendo was down I though maybe nnid settings, It turns out somehow my pnid got unlinked!
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atleast you got your acess back!
its been happening to lots of people including me. im sure itll get an update soon that fixes the problem.