When the chain drops off the chainrings while shifting with eTap AXS and AXS drivetrains, it is often the result of the front derailleur being set up outside of our specifications.
Fine-tuning a front derailleur does require accuracy, but complete setup instructions can be found in the eTap AXS user manual. Even better, a fast and simple eTap AXS chain drop troubleshooting guide should help you get back on the road and enjoy your ride.