When i type this command in and run it, it wont play the sound, I've tried to target specific blocks, entities and such.
I just can't figure out how to play it with command blocks. (I am on 1.20.6. I havent tested if thats the issue yet.)

If you open the function in a text editor, you'll see a playsound command (for example playsound minecraft:music_disc.prazkhanalwhip record @s ~ ~ ~ 4 1). Try running that command in chat. You can change the @s selector to something like @p or @a to hear the sound when it's played from a command block.

If it doesn't work, then 1.20.6 has probably broken the datapack. I'll fix it as soon as I can but there were big datapack changes so it might take a while.