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The code checked for duplicates using "ap_id", but in Mastodon and Misskey the look like that: Mastodon: https://mastodon.example.com/users/roger Misskey: https:///misskey.example.com/users/104ab42f11 The fix is to also check for "uri", which is what will be in the "explicitly_mentioned_uris" list: Mastodon: https://mastodon.example.com/@roger Misskey: https://misskey.example.com/@roger