Set up your Instant Pot, plug it in, turn on the saute mode, and wait 1 minute for the Instant Pot to heat up.
Add oil and chopped onions, saute until translucent (2-3 minutes).
Add celery and garlic, saute until the garlic is fragrant and onions are slightly browned (2-3 minutes).
Add carrots, saute for 2-3 minutes.
Add water or broth, bouillon, and thyme.
Cover and lock the Instant Pot, set the vent to seal, change the mode to manual and set the time for 10 minutes.
Allow the Instant Pot to release the pressure naturally (wait 5-10 minutes) but be careful to keep your fingers away from the vent when you release and open the lid.
Pull out the thyme stems and discard.
If you have an immersion blender, puree the carrot soup in the Instant Pot otherwise allow the soup to cool and puree it in a blender when it’s at a safe temperature.
Stir in the orange and lemon juices, adjust to taste with salt and pepper as desired.