Cannot Erase All Content and Settings

If you can't use Erase All Content and Settings

Erase All Content and Settings is available only in macOS Monterey or later, and only on a Mac with Apple silicon or a Mac with the Apple T2 Security Chip. If this feature isn't available or doesn't work on your Mac:

• To both erase your Mac and reset it to factory settings, follow the steps in what to do before you sell, give away, or trade in your Mac, but disregard the instructions for using Erase All Content and Settings.
• To only erase your Mac without resetting it to factory settings, learn how to erase a Mac with Apple silicon or erase an Intel-based Mac. 
• When using Erase All Content and Settings, if you see a message explaining that other volumes need to be erased before you can erase all content and settings, you might have used Boot Camp to install Microsoft Windows. In that case, use Boot Camp to remove Windows and its partition.