Not really upset. But definitely surprised when BTN says ND isn't part of the Big Ten, but the Big Ten website lists as the current Big Ten champs. They probably need a better explanation for not offering ND games, as they do indeed have the rights in the post-season (note that they offer it streaming).
My intent was to hopefully prevent others from the run-around I got when contacting BTN.

In the Big Ten tournament, the Big Ten does own the TV rights, even for games at ND.

That's why the game is available on BTN Plus and not NBC Sports Plus. It's also why last year's home games were on BTN.