Sidecar Authentication Error

Hello Erroll,

Welcome to Apple Support Communities!

We understand that when attempting to use Sidecar you're getting an error message unable to connect to Steve's iPad. We're happy to help!

Let's make sure that you're meeting all the Sidecar requirements.

"Sidecar system requirements

Sidecar requires a compatible Mac using macOS Catalina or later and a compatible iPad using iPadOS 13 or later.

• MacBook Pro introduced in 2016 or later
• MacBook introduced in 2016 or later
• MacBook Air introduced in 2018 or later
• iMac introduced in 2017 or later, or iMac (Retina 5K, 27-inch, Late 2015)
• iMac Pro
• Mac mini introduced in 2018 or later
• Mac Pro introduced in 2019
•   
• iPad Pro: all models
• iPad (6th generation) or newer
• iPad mini (5th generation) or newer
• iPad Air (3rd generation) or newer

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."

For additional information for setting up and using Sidecar check out this article:

Use your iPad as a second display for your Mac with Sidecar

Let us know if you have any questions.

Thank you for using Apple Support Communities.

Take care!