It seems you are using a Kivuto licence which does not include Lightroom mobile:
Do you remember where you got this licence from?
I chatted with your Tech Support over the weekend and they informed me that it does come with our license. I was not aware that our membership was via Kivuto and am not sure if that is the case. I did save a transcript of our chat session. Will it be helpful for you to take a look at that?
Yes, please send it to me privately.
Hi Otto, I've confirmed your membership is an at home license (redeemed through Kivuto) for desktop software only that your school purchased. (which is cheaper than than a license that includes services) You'd have to talk to your school about purchasing memberships with services if they are important to you.