First time user - add photos is greyed out
I'm a university lecturer with an institutional cloud licence. I'm a heavy Premiere, Audition and InDesign user, and use a number of other Adobe packages but it's my first time using Lightroom, or trying to. I'm on a 2020 MacBook Pro running Catalina 10.15.7 and I cannot get Lightroom to work at all. The Add Photos option is just always greyed out. It's up to date, but even when the tutorial points an animated arrow at the button and tells me to get started, there's nothing doing. Also, it keeps telling me that it can't connect to a network, even though I'm online, logged in and accessing my Adobe account details.
Any way around this basic-but-fatal functionality flaw?
Thanks!