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The solution I found was from this reddit link . Since I cant post the link here, Search of the topic "sidecar only works over wifi plugging in a usbc" It says as follows: (Copy and pasting the content of the post here) Following the instructions, I noticed there were two .plist files in particular that looked suspicious: /Library/Preferences/SystemConfiguration preferences.plist contained a reference to "iPad USB" (even though I didn't see iPad USB in my "Network" settings). NetworkInterfaces.plist contained multiple references to "iPad". I made a backup of the two .plist files, deleted them from the SystemConfiguration folder, and rebooted. Voila! Now Sidecar works over USB. This helped me solve my problem. Hope it help you'll