Unable to link my NNID to any Nintendo Account. : r/3DS

Can't link 3DS Nintendo Network ID?? This is the message literally on a Switch, not a PC or smart device. Trying to add funds to the eshop before it closes. : r/3DS

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Why can't i link a Nintendo Network ID to 3DS?

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Nintendo ending Wii U and 3DS eShop purchases in late March 2023

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Unable to link my NNID to any Nintendo Account. : r/3DS

How to Link Your Nintendo Network ID to Your Nintendo Account