Keyboard shortcuts are weird

Hi, it seems like I can only use keyboard shortcuts which exist already, things like"CTRL+A" or such do work, but custom shortcuts like "CTRL+Ö" don't work. I wanted to bind the shortcut for taking a clip with Steelseries Moments, but every shortcut I want to use doesn't work. The one which behaves different is "CTRL+`", which interestingly opens Outlook when using the shortcut from the device, but doesn't when I do the shortcut manually.

Is it really not possible to use shortcuts on the Stream 100? That would be a bummer.

Windows 11, German Keyboard Layout, Software Version 2.4.10 [01.53], Firmware 1.40

Thanks!