These old lenses don’t have any af/manual toggle on the lens. There is only the AF/Manual selector on the body.
Remove the lens and check that the screw drive coupling in the lens mount advances when you set the selector to AF and retracts when you select M. While you have the lens off, check that the female part of the coupler rotades when you move the focus ring. If things look right, mount the lens on the body again and make sure that it clicks into place.
Make sure that the aperture ring is on the most closed setting. (f/22 on your lens, if I remember correctly.) AF will be inactive if the aperture reads EE.