It’s been discovered that you can’t get Club Nintendo rewards if you’re buying WiiWare or Virtual Console games through Wii Mode on the Wii U. To claim your Club Nintendo rewards you will need to purchase WiiWare or Virtual Console games on your older Wii console, if you’ve still got one. Nintendo says that this issue is caused by certain system constraints.
All Wii U games purchased on the Nintendo eShop are automatically registered to your Club Nintendo account. See the eligible products list to see what games are available for Coins. Note: Due to certain system constraints, Club Nintendo accounts cannot be linked to the Wii Shop on the Wii U. Games downloaded through the Wii Shop on the Wii U (in Wii mode) do not qualify for surveys or Coins.