In your Instant Pot, combine butternut squash, vegetable stock, garlic, apple, sage, onion, turmeric, salt, black pepper, white pepper, cayenne, cinnamon, and nutmeg. Stir to combine, then cover with lid and make sure it's locked closed.
Set vent to "Sealing" and press "Pressure Cook", set the "Pressure Level" to high and press the + button until the time reads 9 minutes. Let it cook until it beeps to indicate that it's done.
Using an oven mitt or towel, carefully move the valve to the “Vent” setting and let it release all the pressure that’s built up. It will be a loud whistling sound, and may take a few minutes before it stops. Remove the lid.
Carefully remove and discard the sage sprigs, and then stir in the coconut milk.
Use an immersion blender to blend until smooth.
Transfer to cups or bowls and serve immediately. Enjoy!
Optional: Garnish each bowl with a small swirl of coconut milk and freshly ground pepper.