 as we have had issues with these in the past.
If the green LED is on, check the SD card to ensure the proper configuration details (joints, motors, controllers) are set.
If all else fails the issue likely lies within the code and you will need to do a carefult review.
During this stage, be sure to leverage Serial.print(“TEXT” or VARIABLE) with the Teensy connected to the computer via the USB cable.
This will enable you to startigically print text/variables to the serial monitor in the Arduino IDE which