Package mode NOT working

OK, we set up the package mode to let us know when our deliveries were to arrive, even setup the field were the packages would be detected to let us know that they arrived. However in all the time that we set it up, we've gotten several packages, and NOT ONCE did the Ring ever go off during all of this. The ONLY time that the package sensor went off is when someone was leaving and their pag tripped off the sensor. Beyond that NOTHING. I'm wondering if these are in beta test and thrust upon us to getting them to work right because this hasn't worked right since turning it on. What's going on here?