NNID on Wii U was taken, unsure what to do?

[MatthewL246_PNID]

First, I’d like to ask whether “ALiteralCabbage” is the same username as the NNID you used on Nintendo Network? This is a pretty common issue.

Can't sign in - Password Incorrect Every Time

Does your PNID use the same username as your NNID? If so, you unfortunately won’t be able to sign into the PNID on your console and will need to create a new one with a different username.

If it is not, the error saying that the NNID was taken makes me think that you might have accidentally chosen the option to create a new NNID instead of linking an existing one when signing in on the console.