non-working CMD-key: Linux Moonlight to Macos Sunshine

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Hi folks

I'm in the weeds on this one:
What is expected behaviour here?

My client is Linux Moonlight
My host is Macos Sunshine.

Audio/Video is working fine.
Mouse/Keyboard is working fine.

Exept for the CMD-key.
No combination works.

Which key on Linux should trigger a CMD on Macos?
Is additional setup client/server needed?

I currently have no keybindings in server conf,
and no extra keyboard settings in gnome-tweaks.

Thanks a lot!

FWIW I attach a photo of my keyboard.