There is a hole cover plate that has to be pushed by rounded plug pins to pivot and unlock the socket holes. You can try pushing with something like a screwdri

There is a hole cover plate that has to be pushed by rounded plug pins to pivot and unlock the socket holes. You can try pushing with something like a screwdriver (to test for live) and it's hard to pivot the plate (feels like it needs both pins to pivot), and a non round tool snags on the plastic cover plate.