Sidecar Not Connecting? Use Your iPad as a Second Display for Your Mac

Q: Can I use Sidecar with someone else's iPad?

No. Both devices must be signed in with the same Apple Account using two-factor authentication.

Q: Why does the wireless display lag or freeze?

That points to wireless interference — connect over USB for a stable link, or move the devices closer and away from interference.

Published ✓ Verified ⏱️ 2 min read October 18, 2025 · by Ryan Bennett

You want to use your iPad as a second display with Sidecar, but it won’t connect or doesn’t show up in the screen-mirroring menu.

Why: Sidecar is a Continuity feature, so wirelessly it needs both devices on the same Apple Account with two-factor authentication, Wi-Fi, Bluetooth, and Handoff on, and close together — with neither device sharing its connection. Wireless interference and an untrusted USB link are the usual culprits.

Fix 1: Check the requirements, then connect

Sign both devices in to the same Apple Account with two-factor authentication on. (Sidecar doesn’t support Managed Apple IDs.)
For a wireless connection: turn on Wi-Fi, Bluetooth, and Handoff on both, keep them within about 30 feet (10 meters), and make sure the iPad isn’t sharing cellular and the Mac isn’t sharing its internet.

Then connect:

macOS Monterey or later: click the Screen Mirroring menu in the Control Center / menu bar and choose your iPad.
macOS Big Sur: use the Display menu in Control Center or the menu bar.
macOS Catalina: choose your iPad from the Display or AirPlay menu in the menu bar.

Fix 2: Connect over USB instead

A cable rules out all wireless problems:

Plug the iPad into the Mac with its charging cable.
On the iPad, when asked, tap Trust so it trusts the Mac.
Select the iPad from the Screen Mirroring / Display menu again.

Fix 3: Reduce wireless interference

If the wireless connection keeps dropping or won’t form, it’s usually Wi-Fi and Bluetooth interference. Move the devices closer together and away from other wireless gear (microwaves, USB 3 hubs, crowded 2.4 GHz networks), then retry — or use USB (Fix 2).

Fix 4: Toggle radios and restart

Turn Wi-Fi and Bluetooth off and back on on both devices, then restart the Mac and iPad and try connecting again.

FAQ

Can I use Sidecar with someone else’s iPad? No. Both devices must be signed in with the same Apple Account using two-factor authentication.

Why does the wireless display lag or freeze? That points to wireless interference — connect over USB for a stable link, or move the devices closer and away from interference.

Sources: Apple Support — Use an iPad as a second display for a Mac