Turn on the Sautee function of your Instant Pot. Once it's hot, add the olive oil.
Once the oil is hot, add in the carrots, celery, and onions and cook for 5-7 minutes o until softened a bit.
Add the garlic and cook for an additional minute.
Add the tortellini, broth, water, salt, and pepper.
Set it to High Pressure for 4 minutes. Check that the valve is in the sealing position.
Caefully do a manual release (switch the valve to the venting position).
Stir in the spinach and cream. The spinach will wilt almost immediately.
Ladle into bowls and garnich with Parmesan, if desired.
Refrigerate in an airtight container for up to 4 days.