NBCSN Blackout - NHL - Penguins Canadiens

I live in the Dallas Ft. Worth area.  Yesterday evening, and for no legitimate reason, the Penguins Canadiens NHL game, which began at 7:00pm CT was blacked out on NBCSN Channel 220.  My equipment, service address, and billing address are all the same and are located in the Dallas Texas area.  Blackouts apply when the game is being aired on a regional sports network, however since I live in the Dallas Texas area, there was no regional channel showing the game.  I have contacted both DirecTV technical support as well as NBC Sports support.  DirecTV support claimed it was the channels that control their own blackouts, but when I contacted the channel NBC Sports Support team, they blamed DirecTV and said I should speak to my TV provider, which I obviously already did multiple times.  I'm not looking for workarounds to the issue, since I'm looking for a reason and a resolution since this is a recurring issue.