Application Express - How to grant execute to users on APEX_UTIL.WORKSPACE_ACCOUNT_DAYS_LEFT

I need to know how to grant execute on APEX_UTIL.WORKSPACE_ACCOUNT_DAYS_LEFT to <application users>; in APEX.

I logged into the Workspace as Administrator went to edit on my application -> went to SQL Workshop and tried

grant execute on APEX_UTIL.WORKSPACE_ACCOUNT_DAYS_LEFT to <username>;

ORA-04042: procedure, function, package, or package body does not exist.

I went into the APEX Administrative Services figuring that is where I need to perform this however I am unable to locate where I would do this.

Thanks,

Beverly Selby