I have the photography programme (Creative Cloud Desktop, Photoshop, Lightroom, Bridge), and for the past few weeks, since an update to Creative Cloud, I've been having lots of difficulties with sign-in.
1) Everytime I reboot my pc, I am prompted to sign-in to CC Desktop. Within a few hours, I am automatically signed out, and prompted to sign back in again.
2) In Lightroom, I have to sign-in to Lightroom Mobile everytime I load the program. I have Lightroom on my Android phone.
3) In Photoshop, it shows that I'm logged in under the "help" menu, but when I attempt to sync my preferences, it states that I am not signed in, and I'm unable to either upload or download my settings.
I have deleted everything, including preferences and cache files and tried to reinstall, and the problem is still occuring.
For anything more contact support. Sounds to me more like your account may need a full server-side reset, anyway.