You have the Wahoo Elemnt app installed on your Android device, and paired with your Elemnt cycling computer. When you open the “Set Up Sensors” menu in the Android app, you cannot see the “Fitness Equipment” designation for the Neo as a controllable trainer.
Unknown at this time, but obviously an issue with the Android version of Wahoo Elemnt app version 184.108.40.2066.
Wahoo has been advised of the issue, and a solution will need to come from their Android developers.
You can still pair your Wahoo Elemnt cycling computer to the Neo in either the iOS version of the Elemnt app, or directly through the on-screen menu of the Wahoo Elemnt cycling computer.