The main reason as to why your SMS aren’t sending from HQ is that in order to send SMS from HQ you send to supply a mobile number for HQ. This is so that you have a reply number otherwise if the person you have sent an SMS to then sends you a reply to that SMS you will not receive it. You can add an SMS number either in the admin section if you have admin rights or you can go to Tools->Options and there is an SMS number option on there.