@pfefferle Oh, my! I should have found the issue. Activitypub sees that all my posts come from the very old website where my profile went to "/author/ilmondopositivo" -the Italian profile-. Now, the new one has a new name "author/admin" and I don't even know why, because its handler is always "ilmondopositivo"! Why does it behave like that? It's obvious now that "/author/ilmondopositivo" points to a 404. It does not receive the proper name!