Season beef all over with salt & pepper, coating generously. Add the olive oil to the bottom of Instant Pot, then the roast. Add remaining ingredients except for baguettes, cheese, red onion, arugula, butter and flour.
Place lid on Instant Pot and make sure valve is set to seal. Press the pressure cook button and set to high, then cook for 40 minutes. Instant Pot will take about 10 minutes to come to pressure then pressure cook for 40 minutes.
Let the pressure naturally release (should take about 15 minutes). Open the lid when pressure gauge has dropped and the lid opens easily. Remove the roast and shred it.
Meanwhile, add juices to a 4-cup pitcher and set aside. Turn Instant Pot to saute mode. Melt butter, then whisk in flour. Add the juices back to the pot, whisking constantly to prevent lumps, then bring to a boil. Simmer for 5 minutes or so until thickened.
Serve shredded roast over mini baguettes, pouring a bit of au jus overtop then adding provolone cheese slices, sliced red onion and arugula. Serve French dip sandwiches with more au jus on the side to dip. Enjoy!