When a computer function works in another app, user account or port, keep the repair inside the failing context. For Universal Control between Mac and iPad, first place devices nearby, confirm the same Apple Account and test without VPN/hotspot.
What this covers
- Universal Control between Mac and iPad with this exact failure state
- Diagnosis across device/software eligibility versus account, proximity, Bluetooth, Wi-Fi and display arrangement
What it does not cover
Try in this order
0 of 4 completedCapture the exact failure state
ReversibleName the failing app, user account, port or peripheral and one that still works. Expected behavior: move pointer and keyboard between supported nearby signed-in devices.
Isolate the component boundary
ReversiblePlace devices nearby, confirm the same Apple Account and test without VPN/hotspot. Swap only the app, account, cable, port or user profile while keeping the computer unchanged. Boundary to separate: device/software eligibility versus account, proximity, Bluetooth, Wi-Fi and display arrangement.
Correct only the proven cause
ReversibleUpdate and re-add the nearby display arrangement. Repair the isolated app, user profile, driver binding or physical path.
Verify and stop safely
ReversibleRetest both contexts after sign-in and one cold restart. Do not reset devices for an unsupported model or managed-account restriction.
Evidence ledger
Sources behind this answer
Exact questions