I thought that when you try to open a piece of software on the Wii U without the ticket it gave you the error about how the software cannot be used because the NNID used to purchase it was deleted.
Not really relevant. It's just throwing an error since the software can't be verified without a ticket.
It only says the NIND can't be seen because you only get a legitimate ticket via purchase. So if the ticket is wrong, malformed, missing, etc, it shows that error.