I asked admin of my instance few minutes ago and didn’t get reply yet, but it seems your instance(mastodon.sdf.org) blocks pone.social.

EDIT: my instance isn’t blocking mastodon.sdf.org

  • CJOtheReal@ani.social
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    1 year ago

    From my understanding some problem with federation happened and because of that SDF upgraded the instance

    There was no outgoing federation happening