Btw did I mention it on FANBOX? I didn't have to on the other platform because the integration bot automatically spammed everyone so there I knew it worked... Don't know about FANBOX integration bot tho...
But yes there is a discord server... the Fanbox discord integration bot has been setup, and should work... probably...
So if you missed it then... now you know
Tutorial if you need it
https://fanbox.pixiv.help/hc/en-us/articles/49392364778649-How-do-I-join-a-creator-s-Discord-server