New Canyon bike: won't shift into lowest gear (largest rear cog)

[jjef_21]

I ordered a brand new Canyon Endurace that simply won't shift into the easiest gear. It's almost as if the whole shifting is off by one. When in the highest (hardest) gear, there is one more shift click available, even though it won't shift further. But in the 2nd lowest (easiest) gear, there's no more room to shift. Despite playing with barrel adjuster and lower limit screw, I cannot manage to move the derailer far enough to the left to get it into that low gear.

Is the cable tension (clamp) too tight, too loose? I just don't know what to do. I've looked at the Park Tool guide for rear derailers, but it doesn't help when the limit screws or barrel adjuster doesn't move it any further.