Sidecar doesn't work between my MacBook Pro 13" and iPadOS

To verify it is on, Go to Settings->Account->Password & Security, and make sure the entry for Two-Factor Authentication is turned on.

If you don't have an iPhone, you can setup a non Apple phone to receive the security codes via SMS or voice call. This includes land lines and Android phone numbers.

See the linked support document above for how to do that.

What about Two-Factor Authentication? Are you using that on your Apple ID?

To check the iCloud account on the iPad, go to Settings->Account(top of Settings) and see what email address is logged in there under your name. On the Mac go to System Preferences->iCloud /Apple ID and see what email it says you are logged in there with.

Both must match.

A 6th generation iPad should work with Side Car.

Is the following all true?:

From Use your iPad as a second display for your Mac with Sidecar - Apple Support

• 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.

Please provide the actual model number of the iPad, also found in Settings->General->About->Model Number

Also, is the iPad logged in to iCloud with the same Apple ID as the MacBook Pro?

I finally made it back to you.

We are all just volunteers here.

We all only help out our fellow users when we can and when time allows.

So, I wad unable to return to your post for awhile.

I see Phil was able to try and attempt to help you with your SideCar issues.

Since you appear to not know very much about Macs and iOS devices, maybe it was a fluke that SideCar connected up to both your Mac and iPad the last time you tried this.

Everything on both your Mac and iPad had already been setup perfectly without any interference from you.

Maybe you inadvertently changed something either on your Mac or iPad that broke the SideCar connectivity.

I think you really need to contact Apple support via the contact support link located at the upper right hand corner of every Webpage of these Apple support communities.

Use the Device Performance and Connectivity support categories.

OR

by installing and using the Apple Support app found in the iOS App Store.

Tap the iOS App Store link below.

https://apps.apple.com/us/app/apple-support/id1130498044

OR

Call contact Apple via the support numbers found in the link bekow.

Contact - How to Contact Us - Apple

Tap the link below.

https://www.apple.com/contact/

Best of Luck to You!

What year and model iPad do you have/own?

The “A” model number can be found on aluminium back of your iPad in small print right under the larger bold print “iPad”.

What is the rated, internal data storage space/capacity of your iPad model and how much of this free, internal data storage capacity is left inside of your iPad model?

All of that additional info can be found in the Settings app, General settings panel, About.

Please attempt to answer all questions asked.

Thank You.

Click here: What is two-factor authentication - Apple Support

What iPad model?