Rub the taco seasoning over the surfaces of the chicken breasts. Set Instant Pot to saute. Heat the olive oil and add the chicken to the pot. Cook for 3 minutes/side. Do this in batches, if needed, and transfer chicken to a cutting board.
Pour the chicken broth into the Instant Pot and deglaze the pot (scrape the bottom with a spoon). Place a trivet into Instant Pot and Place the chicken breasts in a single layer on top of the trivet.
Place the cover on the pot and set timer to 5 minutes on high pressure (pressure cook setting). It will take the IP around 10 minutes to build up pressure before it begins cooking.
When cooking time is done, let the pressure release naturally for 5 minutes then set to Quick Release. Let the float valve drop and remove the cover. Transfer the chicken breasts to a cutting board. Using two forks, shred the chicken and add it back to the pot. Mix well.
Divide the meat between the tortillas and top with cheese and toppings of your choice!