Some car models are not compatible with some devices but I'm assuming this is Uconnect? Dodge/Jeep/Ram/Chrysler generally have the same sort of keyless entry system and on board computer. It shouldn't be any different than on your Charger.
Maybe try unpairing everything on your phone and then try again? Make sure your car is set to pairing mode? You might want to consult your owner's manual or contact the dealer to see if they can assist.
I also recommend getting a newer/more powerful device. The Ace II X is going to keep causing headaches because it's a low end Android.