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To use Continuity, turn on Handoff on both devices. On Mac, go to Apple menu > System Preferences > iCloud > sign in. On iPhone, go to Settings > tap name > iCloud > sign in. Reboot your Mac, then turn this setting back on. Go to the iMessage tab, and under your Apple ID, uncheck Enable Messages in iCloud. On a Mac, launch the Messages app and select Messages > Preferences from the menu bar. Turn it off, reboot your device, then turn it back on using the same method.
HOW TO CONNECT IMESSAGE TO MACBOOK MAC
If it is, deselect your Mac and restart your iPhone. Then, on your iPhone, go back one screen and check Text Message Forwarding to make sure your Mac has been selected. Make sure that both devices are signed in with the same Apple ID. On your Mac, open Messages and choose Messages > Preferences > iMessages.
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Why are my iMessages not syncing between iPhone and Mac?
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2 Why are my iMessages not syncing between iPhone and Mac?.1 How do I connect my iMessage to my Mac?.
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