My 2020 Fusion with Sync 3.4 along with CarPlay (I have a X with the latest iOS) doesn't play well with Uber and I do believe it's Uber.
When I just use a Bluetooth connection if Uber pings for whatever reason Sync treats it like a phone call.
When I am using CarPlay Uber and the radio don't always sync. If a ping comes from Uber the music stops. I found that closing Uber and re-opening gets the two to play a little better and when I get a ping from Uber it just lowers the music for a brief second.
When I just use a Bluetooth connection if Uber pings for whatever reason Sync treats it like a phone call.
When I am using CarPlay Uber and the radio don't always sync. If a ping comes from Uber the music stops. I found that closing Uber and re-opening gets the two to play a little better and when I get a ping from Uber it just lowers the music for a brief second.