Adding a homebrew Fighting Style Feat

So, I'm trying to add the Pouncing Fighting Style feat from the new Obojima book to the game for a character (since that book isn't compatible with Dnd Beyond yet). However, after creating it, I found that I can't select my homebrew feat when creating a character, it shows up in the ability score improvement options, but when selecting a fighting style from a fighter's lv1 fighting style (or other classes), it doesn't show up. How do I fix this?

I started by making a copy of Interception, so the perquisites and fighting style tag are in there, but it still doesn't work, I also tried removing all the perquisites except for the lv1 fighter one to see if that did anything, but it didn't work either.

As far as I'm aware, you can't add a custom fighting style to a base class. Your best option is probably to skip over the fighting style option when you're building the character, and just create a standalone feat for your custom style.

Dang, that's unfortunate if that's the case, but thanks for letting me know, I appreciate it!