I just bought a 2020 XT5 and I had the same issue when using my foot under the left corner of the bumper. Now I’m good at it because I found out the sensor is located almost directly underneath the second bumper sensor from the left. Stand directly behind the vehicle and you will see circles on your bumper. Don’t swipe foot from side to side. Just stick foot underneath the second circle and pull it back as if you are kicking a shin. I can do this consistently.