When you try to launch a Creative Cloud application or Creative Cloud Desktop, do you receive a sign-in error? For example, when you launch the Creative Cloud Desktop application, a "You've been signed out" message appears. Or when you open a Creative Cloud app, you get a "Sign In Required" message repeatedly, even though you had signed in previously."
This page offers solutions to these issues. Work through the following solutions in order, and stop when you are able to sign in.
Solution 1: Delete the opm.db file and log in again.
Solution 2: Update to the latest version of Creative Cloud Desktop.
Solution 3: Run the IMSLib Replacer (Windows only).
Solution 4: Set LAN Settings to Automatically Detect Settings (Windows only).