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Banning Mastodon users on Lemmy communities
(lemmynsfw.com)
A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).
If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!
Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration), Search Lemmy
Migrating changes the account completely. There's a connection between the two, if the person chooses to do it that way, but they don't federate as the same account.
So you'd have to ban the new account as well.