No as of the moment, but this is something we're looking to add in the future. You can upvote the request here for updates: https://feedback.heartbeat.chat/feature-requests/p/custom-single-sign-on-sso
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Right now, we use passwordless login (powered by Magic Link) as well as social logins through Google, Facebook, and Discord. Because of this, users don't feel like they create a whole new login & password to join your Heartbeat community.