Canyon Aeroad Headset screw rounded

Here this can get you started. Check compatibility at the bottom. Call canyon they can sell you the screw only. Just in case its not hex head, it’s torx so you may have been using the wrong tip on there and may still be able to adjust it with the right torx tip.

https://www.canyon.com/en-pa/gear/bike-parts/spare-and-wear-parts/spare-wear-parts/canyon-gp7066-02-fork-clamp-kit/10012666.html