Thanks. For the benefit of others, I thought I'd ask since I have a very similar issue. My PAAK stopped working out of the blue on my 2020 Aviator a couple months ago and I'm pretty motivated to get it fixed. When I get in the vehicle, the app on my Pixel 7 switches back and forth between connected and disconnected, and it won't start without the fob. I called the concierge and they walked me through the whole removal of the app and reset of PAAK, etc. Now the app fails to complete setup every time I try it, but ironically I get a notification in the app saying PAAK is enabled for my phone during setup before it fails. I think there's something wrong with the low energy Bluetooth antenna/module for PAAK preventing my phone from actually communicating via low energy Bluetooth with that module. I'm not sure if that's also called the RFA module, but I did find two SSMs (49968 and 50845) that I shared with the dealer when scheduling my appointment, so I'll circle back with whatever they find. For completeness, my remote start and door locks work great through the app and Bluetooth phone connection,
Android Auto, and music all works great, so its just the PAAK connection that refuses to connect.