Dealer was able to fix the lane keep assist calibration issue. Steps in TSB 23-na-095 did not work on my truck. I was advised that they used Autel equipment (not sure of spelling etc) and were able to get the camera past the 94% calibration point and attain full calibration. Lane keep assist functionality is working now.
2022 Sierra with lane keep assist unavailable. Dealer changed camera but could not get it to calibrate. Stops at 94% complete. Told me to drive truck about 100 miles and if it didn’t calibrate to come back. Since then I have found a TSB that details explicitly how to get camera to calibrate in situations where it stops at 94%. I hope dealer also has that but I’ll bring with me when I return.