Everything was working fine up until a couple of weeks ago when my universal remote stopped controlling my AppleTV. I’ve tried rebooting both the AppleTV and the sound bar and going through the setup for the remote again but it doesn’t seam to be able to connect.
Thank you for your post and welcome to the Bose Community.
I'm sorry to hear that you are having trouble with your universal remote controlling your Apple TV.
Has anything changed in your setup recently? The universal remote uses a Bluetooth signal to communicate with the soundbar, which will then send out an IR signal to control the Apple TV. Therefore, ensure that there is nothing blocking the Soundbar 700.
Additionally, is your universal remote still working to control everything else?