If they’re banned, so I can get them unbanned by just initiating the coin join again?
Checkout nostr:npub14zln9kg0yx7qdn2kx8p2z9zdrz3ujfhyx6adeepmjsl98gjlfj5sr6fcn4, coinjoins are happening frequently recently.
It might be because your coins got banned for failing to sign a round, check CTRL+C+D coin list for warning triangles.
Discussion
There is a timeout, so you just have to wait a couple hours (or days, depends).