By enabling this options, the moderation bot will automatically moderate duplicate messages. That means if a user send the same message twice within X seconds, the second message will be deleted.
To enable this feature, first you have to create a client onyour provider side (check the related documentation for enabling OpenID Connect).Then go to the [plugin settings](/peertube-plugin-livechat/documentation/admin/settings), and enable "{{% livechat_label external_auth_custom_oidc_label %}}".
Note: if you want to restrict allowed redirection urls onthe provider side (best security practice), the plugin will show youthe url to allow.Just copy it in your OpenID Connect application configuration.