Yes. While creating template content – whether through the copy-paste option or the create-new-message option – it is mandatory to mention the entity's brand name (complete business name, brand name or trademark) in the content field. Ideally a business should only use brand names it is officially registered for.
Sample content: Congratulations! You have received shopping voucher worth Rs. {#var#}. Valid till {#var#}. - <Brand Name>
The detailed procedure differs slightly between operator portals. If you want experts to do it for you, our DLT priority support plans cover entity, header and template registration, and our template approval guidelines blog explains common rejection reasons.