Live Listen always gives “Unavailable for current route”
I’m trying to get Live listen to work on my AirPods (for my mom, actually). I have an iPhone 8 with 12.1, and every time I try and turn on the feature in the control center, the feature has “Unavailable for current route”, and won’t let me turn it on. My AirPods are in my ears and work just fine for music/phone, but I wanted to use this feature so I could talk to my hard-of-hearing mom in a noisy setting. Any suggestions?