Hey
I've been trying to incorporate this mod into a modpack of mine but kept running into the same problem: on startup the mod isn't creating any server config file. I've also tryed taking config files from other modpack creators using the same mod (same version and all ) but the mod asn't been able to recognize it. I've had this issue with all 1.16.5 version of the mod and i'd like to add more than 10 max hearts but can't.
Help appreciated ! (and sorry for bad english)

Where do you expect the config file to appear?

I know this post is old but I FOUND IT!! It's under the server config folder on your server panel's world folder!!