You are getting The security token is missing from your request notification while accessing your cPanel administration page.
Basically, this is not an error. It’s just a warning which you can definitely ignore. There are possibility that causing this warning,
• You are accessing your cPanel administration page from a bookmark or browser history.
• You are accessing your cPanel with multiple session. The security token will get invalidated when there are mismatch of cPanel sessions (1 session is logged off and 1 session is still logged on).
You can log in again to resolve the warnings.
Your security token will be updated.