I'm having the same issue. I have no clue what Error Code: 107-3021 is.
I've tried almost everything and I still can't purchase anything from Nintendo eShop not even download the free Mercedes-Benz DLC for MarioKart 8.
Even in Smash Bros.WiiU i cant download Mewtwo as a DLC character without the error code 107-3021 showing up again.
I can do everything online such as playing online with friends and using the internet but I just can't purchase any DLCs.
it also says "information help: 1. 5.3.2U // 2. WUP-001(02) // 3. FW403504518 // 4. AMK4-0210-7375.
WHAT IN THE WORLD THIS MEANS?!?!?!
The worst part about this is Nintendo support site dont even know what this code is. When I type it in the support site it says the code is unrecognizable.
PLEASE IF ANYONE HAVE ANSWERS FOR THIS THEN LET US KNOW!!!
That "Information Help" Is your specific Wii U.
Depending on when you tried the serves might have been getting hit due to the Splatoon demo.
It's one of those errors that can be anything. This place isn't really Nintendo tech support so you'll be hard pressed to find answers to a unknown issue here.
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