You might have issues using FaceTime for one of these reasons:
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If none of the above reasons apply to you, and you still can't make or receive FaceTime calls, follow these steps:
If your cellular connection or Wi-Fi network are running slow, or other users are streaming audio or video on the same Wi-Fi network, you might have these issues:
Make sure that both you and the person that you're calling are using a fast Wi-Fi or cellular connection. If you’re using Wi-Fi, FaceTime requires a broadband connection.
Apple Magic Mouse 2, Magic Keyboard, Magic Keyboard with Numeric Keypad, and Magic Trackpad 2 work wirelessly with your Mac via Bluetooth when they're paired and turned on.
If your devices came with a new iMac, they're already paired with the computer. Just turn them on when you first turn on your Mac. To make sure that your device is turned on, check its power switch. If green is visible, the device is on.
If you bought your devices separately — or if they've become unpaired from your Mac — follow the steps below to pair them.
Follow these steps to set up your Magic Mouse 2, Magic Keyboard, Magic Keyboard with Numeric Keypad, or Magic Trackpad 2:
1. If your Bluetooth device came with an iMac, a Lightning to USB cable was also included in the box.
2. Magic Mouse 2 can't be used while connected to the cable.
If you're not sure which device you have, you can learn how to identify your Apple wireless mouse, keyboard, or trackpad.
Then use a wired mouse or trackpad — or the built-in trackpad if you're using a Mac notebook — and follow these steps to set up your earlier Apple wireless devices (such as the Apple Wireless Keyboard, Magic Mouse, and Magic Trackpad):
1. Apple Wireless Keyboard requires the passcode that appears on your Mac. Enter the 8-digit passcode on the keyboard, then press Return. Earlier models of Apple Wireless Mouse or Apple Magic Trackpad will connect automatically or show a dialog. If you see a dialog, click Pair or press Return.