Category string not working

Hi buddy. It took me a while to get the hang of it but I made it work. I got most parameters working except the most important, the category parameter! This is what I have which is working https://xtremeplatform.com?call_custom_simple_rss=1&csrp_thumbnail_size=full&csrp_posts_per_page=2 however when I add the post category id, it doesn’t work… https://xtremeplatform.com?call_custom_simple_rss=1&csrp_thumbnail_size=full&csrp_posts_per_page=2&csrp_cat=329
You can verify this category id is valid here https://tinyurl.com/277uktjm – Can you please help??