Only click the car wash button when you're very close to the machine, and make sure:BB88 wrote: ↑ Similar happened to me. The station is listed as a participation location that accepts in-app purchase car wash. The Shell app said click the Car Wash button when it's flashing green, but the car wash machine was flashing yellow and asked me to "Enter a code". The station attendant was clueless and didn't want to help, and just asked me to use it at another location.
1. Enable "location" on your phone
2. Turn on bluetooth on your phone (I had same problem at the first time when I didn't turn on bluetooth). I guess the code is sent via bluetooth connection.