Recipes do not work.

Simple as that, custom datapack recipes do not work. I have made a few and when i tried to craft them it just doesnt work. I have went fromr enaming the recipes folder to recipe, to changing versions. to downloading other people's datapacks with recipes in them and even they havent worked. I have tried the versions 1.21.something and 1.20.2 im actually about to give up lol