I just configured a Raspberry Pi 3B+ as a thin client for a Windows Server 2016 and everything is working fine except that I can't make the Function keys of my wireless keyboard (this model exactly) to work. All the other keys are recognized, even the Fn shortcuts (present in each of the F-keys) work

I've googled and tried without success some tips (like pressing Fn + ESC, since this keyboard doesn't have an F-lock key), but no success. If I plug a wired keyboard, everything works smoothly.
Any ideas of what I can do to solve this problem?
Thanks!