Lightroom on iPad won't sign on to Enterprise account (U.S. Army). It states Trial Period is over. How do I log into Lightroom with my Army Creative Cloud Account?

I have a CC account through my work as a civilian with the US Army. We use CC Suite. One reason we use it is so we can use Lightroom to work on imagery while away from the office. I had the trail version of Lightroom installed on my iPAD, but now when I try to run Lightroom and sign in, I get the message that Lightroom Trial has expired. Isn't there a way to sign in with my @us.army.mil account?