Use seasoning packet as a rub to thoroughly coat corned beef. Place beef in the pot.
Secure the lid, making sure the vent is closed.
Using the display panel select the MANUAL or PRESSURE COOK function* . Use the +/- buttons and program the Instant Pot for 70 minutes for a sliceable corned beef, 90 minutes if you want it “fall-apart” tender.
When the time is up, let the pressure naturally release for 15 minutes, then quick-release the remaining pressure.
Remove corned beef to a cutting board and cover loosely with foil to rest, reserving juices.
Remove the trivet and place the vegetables into the pot with the reserved juices. Secure the lid, making sure the vent is closed.
Using the display panel select the MANUAL or PRESSURE COOK function* . Use the +/- buttons and program the Instant Pot for 3 minutes.
When the time is up, quick-release the pressure.
Slice the corned beef against the grain and serve with vegetables.
Notes
*If your Instant Pot does not have a MANUAL function, use the Pressure Cook function.