Sorry that you cannot add photos in Lightroom desktop as "Add Photos" option is grayed out. This is not a typical experience, let's make it right.
Could you check and drop me a Private message to describe your license type? Is it a normal Photography Program License? Educational? Corporate (Enterprise)? We've discovered instances of a Corporate license where the issue turned out to be the Corporate Admin controls. Please reply in to this comment with your license type or send me a Private message.