Advice around PM Space

I am part of typical b2c commerce space where i am working in platform as PM. Recently we have been also asked to focus on growth aspect of business like getting more users. With that caveat, we have been asked to use promotions like coupons or cashback in addition to product feature as a tool to grow user base. Now this directive has come from product side of house and causing friction with our marketing teams. Marketing thinks we stepping on their toes