Feed for category – what am I doing wrong?

I’m trying to set up an RSS feed for this category: https://www.essexmums.org/products/?cat=2025 and so far I’m failing miserably!

I’ve been through the options on here: https://codex.www.ads-software.com/WordPress_Feeds but they just seem to bring up feeds of all the products. I’ve tried https://www.essexmums.org/products/?cat=2025&feed=rss2

With this one: https://example.com/category/categoryname/feed – I tried using it with the slug and the number but neither brought up anything.

What am I doing wrong? Any help appreciated!