Yeah, I know how to use google. :-)
Nothing has worked.
Try disabling File Sync in the Creative Cloud desktop app. Then sign out of your account from within Photoshop (Help > Sign Out). This should also sign you out of the CC desktop app as well. Verify this. If you are not signed out, sign out. Close all Adobe applications, this includes all of the apps that run in the background and that you only see in the Activity Monitor (anything that begins with "Adobe" or "CC" in the name, but also things like CoreSync). From here, remove* the following:
/Users/[user name]/Library/Application Support/Adobe/Creative Cloud Libraries (the entire contents)
/Users/[user name]/Library/Application Support/Adobe/OOBE/opm.db (just the file)
Reopen the CC desktop app and sign in again. Go to the Assets tab, select Files and enable Sync. Open Photoshop and test Libraries.
*you can rename, move, or delete these items