Can't communicate with specific Lemmy instance

Hi there,

I am not able to lookup guildwars@lemmy.wtf from kbin.social.
Lemmy.wtf have no issues federating with other Lemmy instances, but with kbin it just doesn't work. I've tried other Kbin instances. Same issue.

https://kbin.social/search?q=guildwars%40lemmy.wtf - The page is just blank.

The only thing I can think of, that might be the issue, is that I am using Cloudflare Tunnel for lemmy.wtf. I read a similar issue on kbin.social also had something to do with Cloudflare?

I am guessing something specific is wrong at lemmy.wtf, but why is it only Kbin it has issues with? Any ideas?