Airplay button not showing in iTunes
The airplay button will not show up in iTunes on my MacBook Air, but it does on the menu bar where the wi-fi status is. I can mirror the screen onto my Apple TV, but I can't stream iTunes. It's my roommate's Apple TV so it's signed in on her Apple ID. Does that make a difference? I used to be able to Airplay. My iTunes is up to date.
MacBook Air, OS X El Capitan (10.11.2)