Did the WiiU ask you to register the Amiibo with the system the first time you used it? That's what happened with the Shovel Knight Amiibo. Then it gave me an error that the Mii was not on the system. I could use the Amiibo, but not until the WiiU erased the user data from it. Thanks for the pic!Sooo, my NTAG215s just arrived, and it works. No problems, nothing. Tagmo, Key files downloaded, 20 Hearts Wolf Link bin downloaded (From Firefox lol), load Tag, write Tag (Auto), finished.
About the discussion above with Mii stuff: It seems like the amiibo is registered as "Zero" with some special letters. I was able to open up the Cave of Shadows with it, so everything should work fine.