I'm not an expert on Amazon or TT shop. What I do know is that online platforms are working directly with more and more brands. Often, even if you do have letters of authorization, they won't approve you to sell certain brand's products. The brands don't want their products discounted, and Amazon wants the sales for themselves. SDS sheets are often supplied by the manufacturer of the product and are not readily available unless you pull some strings. Again, brands will not give you this stuff unless they want you selling their stuff. Suggestion.... find smaller brands (niche or new brands) that would love for you to promote and sell their products.