Updated to 3.2.24 today and no tuners or sources found on iOS. Please advise
Exactly the same issue here on my Apple TV 4..
Just checked back and looks like the iOS update 3.2.24 has started to work and found the source tuners. Not sure why there was down time after the App Store updated the iPhones and iPads.
You can always click Add Source and enter the IP of your hdhomerun.