When I receive a phone call now, my MacBooks always open up FaceTime and do not allow me to take the call! This started happening a few weeks ago. I just want the old functionality back again, it looks like this: 


Now, when I receive a call, FaceTime.app starts, my camera's green led comes on (due to FaceTime's preview) and I cannot even accept the call.

It seems possible that turning on WiFi calling on my Mac caused this change in behavior. 

I would really like to understand what went wrong here.
I think what's going on is that with my 2017 Touchbar MBP the only way to take the call is to use the touchbar. This worked for me today.

Next time I will see what happens with the Macbook, which has no touchbar.