tablet pro

Hi - only a week into using windows after 20 years of using mac so could be a simple solution?

When tablet pro is running (artist pad, haven't tried others yet) the volume keys (f1, f2, f3) do not work. all other F keys seem to work eg brightness. As soon as I disable tabletpro they work again.

I've had a look through settings but can't seem to find a setting that would do this purposely?

Is this a bug? Anyone know a fix? Or is it normal - - as i am new to windows I don't have the experience or logic to suss it out - is there anyone who can shed some light on this?

Thanks