In reply to your e-mail, We are writing to let you know that we are the exporters has registered entitled to self certify the origin with goverment by we can certify the origin on the invoice.
Instead form D to obtain a preferential tariffs but C/O by TUS and C/O issued by government which your requested can certify the origin only.
But if you would like to requested C/O issued by government department, Please let us know. We can support you, too.