Getting medical ID from a locked phone

It’s also accessible after a few failed Face/TouchID authentication attempts (i.e. when it asks for a passcode)

Anyone can simply click “Emergency” followed by “Medical ID” in the lower-left corner of the screen.

Press and hold the side button (power) and one of the volume buttons. You should then see the slider for Medical ID as well as Emergency as long as you selected Show When Locked (and Show During Emergency Call) when setting up your Medical ID in the Health app.

Set up your Medical ID in the Health app on your iPhone - Apple Support