If you don't see SHIMANO Di2 in the list of shifters, this means you don't have the most recent version of the app. Update the firmware on your thru axle and check again.
If the firmware is up-to-date but your phone cannot connect to SHIMANO Di2, check if:
- Bluetooth is enabled on your phone and on the derailleur for 12-speed (blinking blue LED) or on the D-Fly unit for 11-speed (red and green LEDs flash alternately).
- You have a stable internet connection