I receive an error message telling me that my trial of LR mobile has ended, although I have the CC Photography Package
It's possible that you have been signed out from the Creative Cloud photography plan. This happens to me about once a week. I have to go into the Creative Cloud application manager and sign out and sign back in in order to get things working again. Don't know why, but that is the easiest way to resolve it. I have reported the issue, but it probably isn't going to be resolved. The Adobe technicians seem to blame it on Microsoft. I'm not going to worry about it. A simple sign out/sign in solves the problem. Takes about 10 seconds.
Thanks for the suggestion. That did the trick. It turns out that I was signed in to LR Mobile with a different ID than Creative Cloud.