macOS: Universal Clipboard stopped working between Mac and other devices: How to fix!

Today is a short one.

If your Mac and iPhone are no longer sharing their clipboard contents, preventing you from copying and pasting the contents of your Mac onto your iPhone or vice versa, this Terminal command will fix the problem.

Open Terminal, run this command. It should be immediately fixed:

defaults write ~/Library/Preferences/com.apple.coreservices.useractivityd.plist ClipboardSharingEnabled 1

This will update the value of the ClipboardSharingEnabled key from 0 to 1. 0 = Not Enabled 1 = Enabled

This can happen as a result of an Apple Account password change. Should you still have problems, then check that:

macOS Handoff Terminal Universal Clipboard