Pop-up to accept/decline FaceTime calls not showing
I have my Mac running Mojave set up to work with FaceTime. I can make calls without any problem. But lately whenever I receive I FaceTime call (either audio or video), the FaceTime app opens on my Mac, I can hear the ring tone, but no popup appears to accept or decline a call. I am forced to take the call on my iPhone. Any solutions for this problem?
iMac 21.5″, macOS 10.14