Is it still under warranty? This is one of the models where HP has posted the incorrect Manual but from the User Guide:
On select products, you can also enhance your camera privacy by turning the camera off. By default, the camera is turned on. To turn off your camera, slide the camera privacy switch toward the icon next to the switch. To turn the camera back on, slide the switch away from the icon. To use your camera, type camera in the taskbar search box, and then select Camera from the list of applications.
Do you have a physical camera switch? Try changing the camera in the camera app, which you have likely done but thought I would mention it.
Be alert for scammers posting fake support phone numbers and/or email addresses on the community. If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".