I am having the same problem with my 2019 Suburban. The fobs have been changed out by the dealership as have batteries, etc as well as “some sort of reset “ the dealership did. I have to be exactly 90 degrees and right on top of my door handle for that push button to work. The remote start might work 20% of the time! Very frustrating with the cost of the vehicle! I have a 2020 Cadillac XT4 parked right by my Suburban and all
of those features work perfectly 97% of the time on it as it does on my company 2017 Silverado! I am going to try the dealership again next week with some of y’all ideas. I am 32500 miles now and need to get it fixed while still under warranty!