I have a 2021 with the UConnect 4 Guardian and an 8.4 NAV system. Sometimes I will send the address via my iPhone to my truck (Send & Go) and it doesn’t get picked up by the truck. Then, when I get in and find it isn’t there, I’ll send it again and it pops up. The UConnect Guardian paid service after the first year is always hit and miss…I’ve tried using my phone to remote start my truck and some days it works, other days it take a couple tries.
The bottom line is Guardian is overpriced for what it is supposed to do and not worth it IMHO until they get it working correctly. This has been a problem of their system for a number of years since at least our 2016 Ram.