Is the iPhone11 supperted for Notify When Left Behind?

You can set up separation alerts for your iPhone, iPad, or iPod touch with iOS 15, iPadOS 15, or later; Mac with Apple silicon and macOS 12 or later; or AirPods with the Find My network turned on.

Here is an Apple support article that shows it needs an iPhone 12 or later

On your iPhone, open the Find My app. · Tap Devices or Items. · Tap a device. Turn on Notify When Left Behind notifications on iPhone · Under ...

Set up and use Notify When Left Behind in the Find My app

Tap Devices at the bottom of the screen, then tap the name of your iPhone Wallet with MagSafe. Below Notifications, tap Notify When Detached. Turn off or on ...

Set separation alerts in case you leave a device behind ...