In a medium bowl, combine the orange juice, soy sauce, garlic, sugar, and ginger and mix well. Set the bowl aside.
Press Sauté on your Instant Pot. Wait for display to read "Hot".
Add sesame oil and chicken to the pot. Brown chicken for about 5 minutes.
Add the liquid mixture to the Instant Pot and stir to coat chicken.
Turn Sauté off and secure the Instant Pot lid.
Turn the valve to “sealing” and press manual or Pressure Cook, select high pressure and set time for 4 minutes.
Once the Instant Pot is done let it Natural Release the pressure for 10 minutes before moving the valve to "venting" for a quick release.
While pressure is releasing, mix the cornstarch and water together in a small bowl.
When pressure has fully released from the Instant Pot, remove the lid and press Sauté.
Add the cornstarch mixture to the Instant Pot and stir for about 5 minutes or until the sauce thickens to your preference.
Serve over white rice.