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want to link my primary 3ds (left) up to my Nintendo switch so I can add money to the system since Nintendo revoked adding funds. A while back I linked my NID
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Nintendo on having Switch and 3DS coexist, wanting multiple Switch units on households
How To Merge Nintendo Switch, 3DS, And Wii U EShop Credit - GameSpot
You can merge your Wii U / 3DS eShop balance with Switch right now on Nintendo's website
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Wii U and 3DS Nintendo eShop sales to end in late March 2023 - Gematsu
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How to Create a Nintendo Account | Support | Nintendo
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Nintendo Support: Regional Compatibility FAQ
Nintendo 3DS Features That Should Really Be On Switch - Talking Point | Nintendo Life
How to setup a Nintendo Network ID- 3ds, Wii U, and Nintendo Switch - YouTube