HBO Now - bluetooth not working

Bluetooth headphones (Beats Solo3) show as connected in my bluetooth settings. All audio is routed to my headphones, except for any content I play on HBO Now's website (using Safari). HBO Now only plays through my internal speakers. I have disconnected and reconnected my headphones, and have restarted my computer. I've also tried using a different browser. All with zero success. Anyone else having this issue? I would love to find a solution, as I am an avid HBO viewer.