How to Unlock Your iPhone 11 Unavailable If You forgot the passcode|3 Efficient Ways 

You need to subscribe to it for full functionality. But you can unlock your iPhone for free through iTunes or Find My.

Make sure you have entered recovery mode correctly and connected your iPhone to your computer using a good data cable.

If your iPhone is not connected to the network or has not been upgraded to iOS 15.2 or above, the Erase iPhone option cannot be used. It is also possible that your iPhone has a bug and does not have the Erase iPhone option. You can unlock your iPhone with iTunes or iCloud.