See below for deleting a Cryptographic APIs user.
You cannot delete a user that is part of an access policy. Update the access policy to remove the user before you delete them.
To delete a Cryptographic APIs user
Log in to the Cryptographic Security Platform Vault for Cryptographic APIs webGUI.
On the Home tab, select Security > Users.
On the Manage Users page, select a user and click the Delete icon.
On the confirmation page, click Delete.