No Problem I figured it out.
TheJulianJES ([BUG] Wrong commands Hue Dimmer Switch 324131137411(EU) RWL021 · Issue #1633 · zigpy/zha-device-handlers · GitHub) gives me the right hint:
“…or pressing a button on the dimmer during reconfiguring.”
And now it works also with this Blueprint, which is more comfortable.
Thanks for trying.