FaceTime video calls grayed out on MacBook Pro

FaceTime isn't working on my MacBook Pro (15 inch from 2018). I am unable to make video calls to anyone and I am unable to receive any calls (video or audio). The option to video call my contacts is grayed out (see picture below) in FaceTime and anytime someone tries to call me using FaceTime, it goes to my phone (iPhone 15 Pro with iOS 26.2.1) instead of my laptop. Voice calls were also grayed out earlier but one of the setting I changed (sorry, I don't remember which setting it was) managed to make that work but now it says "using your iphone" and if I try to switch to video the call drops. I've tried all the troubleshooting I can think of (restarted computer, restarted FaceTime, logged out of my Apple account then back in, my clock is set to the correct timezone, checked as many settings as I can think of on both my MacBook and iPhone, updated my MacBook software to Sequoia 15.7.3...). My camera is functioning just fine and the correct camera is selected in FaceTime. Can anyone think of why this might be happening? I assume it's some obscure setting that's wrong (i.e. FaceTime video on my iPhone wouldn't work until I toggled on "Content & Privacy Restrictions" in the Screen Time settings) but I can't figure out which it would be on my MacBook.