Why can't I get my Proc Foliage to spawn? UE 5.4

Like the title suggests, I am having a hell of a time getting my proc foliage to work. I try on smaller areas, it says the volume is too small. I try on larger areas, same issue. I use ONE foliage type, same error.

Somebody has to have the answer for me, ya? I can’t find any help on YouTube.

Here’s a short video to show what I am talking about.