I don't believe there is any numerical limitation. Would you be able to post a packaged workbook so we can try it on our end?
Thanks for the response, I think Issue is with tableau server. I was able to select all the products in desktop using multi value drop down filter and the same dashboard when I publish to Tableau server I can see only top 100 products.
I have also spoke with our Tableau Admin and he said he did not restrict anything in tableau server to limit number of products in filters.