side car not working

Hello Someguywhocares,

Thanks for asking the Apple Support Communities for help with setting up SideCar. We're happy to check this out with you.

1. First, please ensure the Mac meets the requirements, a 2021 version should, with the correct macOS: Use an iPad as a second display for a Mac - Apple Support

• "Sidecar requires a compatible Mac using macOS Catalina or later.

2. Next, check your iPad is compatible: Identify your iPad model - Apple Support

• "iPad using iPadOS 13 or later.

3. Check this addition settings next:

"Additional requirements

• Both devices must be signed in to iCloud with the same Apple ID using two-factor authentication.
• To use Sidecar wirelessly, both devices must be within 10 meters (30 feet) of each other and have Bluetooth, Wi-Fi, and Handoff turned on. Also make sure that the iPad is not sharing its cellular connection and the Mac is not sharing its internet connection.
• To use Sidecar over USB, make sure that your iPad is set to trust your Mac."

4. If you still have issues, try restarting both devices: 

• Restart iPad - Apple Support

• How to turn your Mac on or off - Apple Support

Cheers.

Thanks for checking all that.

Please verify you are signed in with the same Apple ID on your Mac and iPad: Sign in with your Apple ID

Mac: System Preferences > [Apple ID] > Check the correct Apple ID is signed in under your picture on the top left.

iPad: Settings > [You name] > Check the correct Apple ID is signed in on the iPad under your picture.

Also check Password & Security > Two-Factor Authentication says "On".

Thanks.

Appreciate you checking this out with us here in the Apple Support Communities!

Is your computer running any third-party security? You may need to click the app and open a window to tap or click "Allow" to allow the connection with your Mac from your iPad.

If you can't find any option to allow this, or have no security on your devices, you'll need to contact Apple Support for them to continue troubleshooting this with you.

Please Contact - Official Apple Support

Cheers.