no @ sign with rapoo 9300M keyboard

I am using Ventura 13.7.8 on a iMac 2017.
I installed parallels desktop 20
I am using Windows 11 as virtual machine.
I am using a rapoo 9300M keyboard german.
Problem:
I do not get a @ sign. I get a €. So in case of @ it does not work while in case of € ist does not work. I do not get the sign neither on macOS nor on Windows 11

When I boot Windows 10 (via bootcamp) on the same computer everything works well. I get all signs.
Did someone ran into the same problem?

regards,
Manfred