Computer-to-computer FaceTime calls
I set up FaceTime on my MacBook Pro. It works fine with my son. We both have iPhones, but can pick up calls on our laptops too. My friend got a new iMac and I helped him set up FaceTime. He can call me. It rings on my iPhone and MacBook, and I can pick up on either. But I can't initiate a FaceTime call to him using his email address. He doesn't have an iPhone. My son (a software developer) tried it using my friend's cell phone too. Neither email or cell phone worked. Any suggestions?
MacBook Pro 15″, macOS 10.13