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

Q&A - Nintendo Network

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Can't Link NNID to Nintendo Account. : r/3DS

Nintendo set end date on unlinked Wii U & 3DS balances after eShop shutdown - Vooks

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Update 3] Nintendo eShop on Wii U and Nintendo 3DS discontinued on March 27th 2023; Fire Emblem Fates, Pokémon Bank, and more impacted - Perfectly Nintendo

What is a Nintendo Network ID?