Integrating Alarm Retrofit Kit into Existing Wiring

Hi, curious if anyone has ideas for me. Have a house that's wired on ~16 windows/doors around the house. I had an ADT system installed when we moved here in 2014. Decided to switch to the Ring Alarm when it first came out. Works well - I love it. However, when they released the retrofit kit, I decided it might be good to leverage the wiring. However, I've only been able to get 3 of the zones working, including only 1 of 6 doors. Had no issues with the wiring when I had the ADT system, so no logical explanation for why I can't get the retrofit kit to recognize those zones. Yes, I can alway just leave the wireless sensors on the doors so it's not a life or death thing by any stretch. Thoughts?