Season sirloin beef tips with garlic salt, pepper and dust or coat with flour (I do this on a paper plate).
Set the IP to saute feature and let it get hot. Add oil. Place in the sirloin beef tips and saute until browned. This can be done in two batches to not overcrowd the pot. Remove to plate.
Add in the onion and saute about 1 minute.
Then add in the wine and beef broth (At this point scrape off any brown bits or flour off the bottom of the pan). Then add the Beef Tips and juices back into the Instant Pot. Give it a stir. Next add the cream of mushroom on top.
Close the lid and make sure the pressure valve is closed. Use the Manual setting on High Pressure for 25 minutes. It will take about 10 or so minutes to come to pressure. Once done let it release naturally. This took about 20 minutes.
Once done let pressure naturally release naturally for 20 minutes. You can then manually release by opening the valve to let remaining pressure release.