On Instant Pot press Saute and wait until display says Hot. Sprinkle roast with a bit of salt and pepper on all sides and add oil to Instant Pot. Sear roast on all 4 sides for about 2 minutes per side. Press Cancel.
Pour beef broth, balsamic vinegar and soy sauce over the roast. Then sprinkle sugar on top and add garlic.
In a large piece of parchment paper, add potatoes and carrots. Wrap tightly and place on top of roast.
Close the lid, turn valve to Sealing and press Pressure Cook on High or Manual button for 90 minutes. After let Instant Pot release pressure naturally, takes about 30 minutes.
Unwrap vegetables into the pot and slice or shred roast. Serve hot with lots of au jus.
Notes
Store: Let the cooked dish cool down to room temperature, then transfer to an airtight container and refrigerate for up to 3-4 days.Freeze: I do not like the texture of potatoes once thawed. However, I know many people are OK with freezing cooked potatoes. Freeze roast in an airtight container with some room for expansion for up to 3 months. Then defrost in the fridge overnight.