How to free Control-Space for binding?

Hello, every one!

Control-Space is the default shortcut for Visual Code Studio, but it does not work for me.

After some time figuring out why, the system simply does not 'pass forward' the space button to the application.

Whenever I try to rebind the shortcut (even though it is the default one) the application does not recognise the space being pressed when control is also pressed.

I tried other shortcuts and they work fine, just to make sure the problem was not the application itself.

I also tried to unbind it from 'Select the previous input source' even knowing that it was disabled. But still, that binding seems to be protected or reserved.

How can I free that binding up?

Thanks a lot!