I've been using my desktop lightroom for years, I now have the Lightroom mobile app and wondered why the two devices weren't talkign to each other, have realised that I need to be signed in to the CC on my desktop. It's currently greyed out and says I've been signed out. I try to log in, it lets me (after changing my password and confirming my new password is correct), I sign in and immediately it says I've been signed out. So it seems its impossible to sign in. Please can you help?
Can we see a screen-clip of your System Info ? LR MENU > HELP > SYSTEM INFO...
"CC on my Desktop"- Are you referring to the Adobe Creative Cloud Desktop App ?
What are your "two devices"?
Do you have Collections marked to Sync, and the Sync turned on?