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If it sits and spins like that when you try to register, it might mean the username you want is already taken, try logging in or a PW reset.
Or if you are trying to log on using your Lemmy.world creds, it doesn’t work like that. I’d recommend just making a new account at lemmynsfw
Yep, that’s what I was trying to do. I figured it out after I threw up my hands and spent a couple of hours digesting how the fediverse works at the technical level. I still think it’s dumb that content and the ability to interact with it is federated but authentication isn’t but that’s just MHO.