Question about Logitech MX Keys

Two @ are shown on the keyboard. Depending on the operating system, one or the other works.

First of all, it is important to tell me the exact operating system used.
I can access the language settings and thus also the keyboard layout in my Windows 11 Pro -64-bit system with
Start (bottom or top left in the taskbar)-> Settings -> Time and Language -> Language and Region
Here the region should be GERMANY ... or another country ... add if necessary ... should be displayed.
Within this region, keyboards can be added under -> Options.
Now it should also work with the ADD character (... I reach this with the third keyboard level ... -> HOLD Alt-gr to the right of the space bar and press the Q key (...then @).
Have fun "tinkering" ...
Michael Nagel
PD Dipl.-Ing. (FH)