Place beef in a mixing bowl, add 1 tablespoon oil and toss to coat. Season generously with salt and pepper.
Set Instant Pot to sauté and add another tablespoon of oil. Once hot, add the beef and brown, about two minutes per side. Hit the cancel button, add the enchilada sauce and pressure cook on high for 30 minutes. Let the pressure release naturally for 20 minutes.
Manually release any pressure, remove beef to a cutting board and shred with two forks.
Serve with warmed tortillas, lettuce, tomatoes, avocado, and cheese or any other toppings you desire.