Why can't I log in to cPanel with the subaccount I created via "Preferences / User Manager"?
Subaccounts are not able to login to cPanel directly. Only the root user, resellers, or cPanel users have access to the cPanel interface. Subaccounts can only access FTP, Web Disk, and Email. For more information on subaccounts, refer to our "User Manager" documentation.
The "Manage Team" feature allows the creation of team user accounts so that multiple users can access, administer, and work on a single cPanel account without the security risk of sharing credentials. This feature is available to all cPanel and WHM customers as of cPanel version 112.