So i thought maybe adding another thread instead of writing in the previous one is maybe more helpful, i hope that is ok for you.

I just tried to join !securitynews@infosec.pub And here is the weird Thing.

https://feddit.de/c/securitynews@infosec.pub

Works fine for me.

https://diggit.xyz/c/securitynews@infosec.pub

Gives me an 404.

Any idea what could cause that Problem?