Camera not detecting people

Doorbell camera works when someone rings the bell and I get constant motion alerts from sunlight or other environmental factors. However I am not getting any people alerts. I had a package dropped off yesterday that didn’t record and I literally walked in front of my camera and nothing. I deleted and reinstalled the app and that didn’t help.

Similar problem…delayed alert when someone approaches front door and/or rings doorbell. Camera records them leaving but not approaching or standing there ??? Help!

Did either of you find out what was causing this as have same problem, lovely video of foxes in my front garden and my neighbours going into their house at edge of view but random if coming up my stairs