When email verification through the link in the email is down, it is still possible through entering the 6-digit code into a linked console. If the email has already been verified through one method, there's no need to verify it again unless you change the email.

1. Sign into the Pretendo Network ID, if you haven't already
2. Open the Miiverse app from the Home Menu
3. It should prompt for email verification. Select “Enter confirmation code”
4. Enter the 6-digit code given in the email

1. Sign into the Pretendo Network ID, if you haven't already
2. Select “change users” on the Wii U Menu, then select the user whose account you wish to verify
3. It should now prompt for email verification. Select “Enter confirmation code”
4. Enter the 6-digit code given in the email.