I have been trying to crosspost from here to kbin.social and everything appears to proceed as expected on this instance but the posts never seem to show up on kbin.social.
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I believe kbin have blocked us.
They use different software. Lemmy stops incoming post when defederation happens. Kbin hasn’t implemented that. All their post and comments show up here but none of the post and comments from EH goes there.
This is why the lemmy software is awful. If a site has blocked you, it just quietly fails instead of giving an error.
If you looked at the logs it probably shows up there.