I’ve recently installed. PM10 panel, bell door contact, 2 fobs and a single PIR. All good until I’ve bought equivalent PiR devices from eBay. They are brand new and boxed however they are 3/4years old. These devices will not NETWORK but they are enrolled. Has anyone experienced this. I didn’t think Visonic changed the specification on their sensors. They are 868Mhz same as other devices????