Open Settings > Time & language.
Select Date & time.
Go to the Set the time automatically section and toggle it off.
Ensure you are online, and then open the Creative Cloud app again.
If the error is resolved, turn on the syncing of your computer clock the next time you are online.
If you receive this error message, especially when Trend Micro antivirus version 15.0 or earlier is installed and activated on your computer, learn how to fix it.
You can also delete certificates starting with Adobe Intermediate CA and Adobe Content by using Certificate Manager or by restarting Credential Manager.