Transmission Not Go Into Gear problems of the 2021 GMC Yukon

Vehicle will not shift into gear from park. When it's in gear (you can hold the button to select a gear to move), but as soon as you release the button - it goes right back into park. It comes and goes. I've been stuck in my driveway. Stuck at the grocery store. Had it once surprise me at a stoplight and was almost rear ended - that time I needed to hold the button to escape to the nearest parking lot. Dealer, of course, was not able to replicate as they said the issue does not throw a code. I have video and pictures, which I have supplied. Sometimes the engine light comes on too. Dealership did say there were some service notes in the system regarding a similar problem, but that gm has yet to issue a TSB. I'm honestly worried this will cause a major accident and I don't trust having my family in the car. It's an $86,000 SUV. Unreal and so disappointing.