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@pfefferle@mastodon.social Yes, I sometimes have this error showing up in the "site health" page.
What does it mean? This site only has one user account. I guess it's blocked by something then, but by what and how to unblock it?

I also noticed that on my other site (liminalweb.site) one user seems federated @David@liminalweb.site whereas the two other ones are not (but the backend tells me they are): @Gator@liminalweb.site and @BigKamo@liminalweb.site