2022 FORD E-350 Power Train Problems

Hello, when I start my vehicle and leave it in park and idle the transmission makes a mechanical clicking noise. I went under the truck to try to find the source of the noise. When I was underneath I found that when the clicking noise is active the drive line coming out the rear of the transmission is trying to turn. It is rocking back and forth. This is what the clicking noise is. I tried it with the vehicle in Neutral also. Same result. The transmission is sending power to the driveline while in park and neutral. I have a video I can submit but this form won’t let me include a video. If you response to me through email I will attach it there

The car was put into Park. The driver got out to check the position of the vehicle in the parking space. While looking at the passenger side of the RV, the vehicle began to power in reverse. It knocked over and injured the driver and ran into a fence. The passenger reached over to stop the vehicle just before it ran into two other people.