Add all ingredients EXCEPT green onions and coconut milk to an Instant Pot pressure cooker.
Press “Manual”, then press “Pressure” until the light on “High Pressure” lights up, then adjust the +/- buttons until time reads 8 minutes. Cook.
Then very carefully, turn the vent to “Venting” for quick release, and wait until all of the steam has released and the valve has dropped. Remove the lid.
Either use an immersion blender, or high speed blender to blend the soup until smooth. Stir in the coconut milk and serve topped with fresh green onion.