Add additional permissions to the 'Employee' access type.
1. Log in Service Desk as an administrator
2. Go to the administration tab-> Security and role management->Access Type
3. Go to the Roles tab and Edit the 'Employee' access type by set 'Administrator' to the 'Command Line Utility Role'.
The idea to set the "Administrator" role for the Command Line Utility Role is to provide more privileges (associated to the role) so the ticket can be created. You could also select another role but the role needs to have privileges to create tickets as the maileater needs to do. To do this, you can choose another role that has the function access to create/assign role and set to "Command Line Utility Role" and then test behavior.
4. Save the changes and test again.