Like many of you, I had this same problem. Here’s how I solved it:
I took the test early in the morning, in my parked car, in the garage with the car and garage doors shut (engine off, of course). After getting in the car, I then put on a pair of shooting ear protection over the AirPods (large over-the-ear headphones would probably also work) — you have to be careful not to bump the stem on the AirPod when putting them on or you’ll get an “AirPod not properly seated” message after the preliminary test.
Then get yourself as comfortable as possible, with your phone and right hand resting on something, and your index finger poised just above the screen. Try not to move *at all* during the test (except your finger).
Doing it that way got me results on the first try.