I have a MacBook Pro and my mom has an iPad. When we try to FaceTime each other a message comes up saying the other is "not available for FaceTime". We don't understand why this doesn't work because we are using different email addresses to call each other. I have the same problem when I try to call my dad's MacBook Pro using my MacBook Pro. However, I have made calls from my MacBook Pro to multiple iPhones and vice versa. So why doesn't it work between iPads and other MacBooks? HELP!