Failed calls on my Mac
Mac won't work with iPhone for calls.
MacBook Air 13″, macOS 10.12
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On your iPhone, go to Settings > Phone > Calls on Other Devices, then turn on Allow Calls on Other Devices. On your iPad or iPod touch, go to Settings > FaceTime, then turn on Calls from iPhone. On your Mac, open the FaceTime app, then choose FaceTime > Preferences. Click Settings, then select Calls From iPhone.