iph 11 Pro - does not have depth option in photo edit

Hi there. I’m taking pics in Portrait Mode (tapping Natural Lighting, subject, f, depth lowest - in order to enable the blurred background), but it is not blurring.

also I’m not getting the Depth option while editing a photo already taken. My iph 11 Pro is updated to version is 17.5.1

thank you, ny

iph 11 Pro - does not have depth option in photo edit