To enable jailed shell or SSH access to CPanel user. You can run below command.
chsh -s /usr/local/cpanel/bin/jailshell username
Kindly replace username with CPanel username.
It will show output like below
[root@ ~]# chsh -s /usr/local/cpanel/bin/jailshell abcde23 Changing shell for abcde23. Shell changed. [root@ ~]#