I need help. I use my slingplayer app on my iphone or iPad to watch on my TV through my rook. Have been doing it for years. As of yesterday, the option to cast to my Roku disappeared from the screen on my iPhone. I tried re-downloading the app on both the iPhone and Roku. Can't get it to work. Can still watch on the phone/ipad though. Can someone help please. I believe I have an M1 or M2 sling, but it's not set up in my current location, so I can't check.