睇 MediaWiki:Apihelp-createaccount-param-preservestate 嘅原碼

If <kbd>[[Special:ApiHelp/query+authmanagerinfo|action=query&meta=authmanagerinfo]]</kbd> returned true for <samp>hasprimarypreservedstate</samp>, requests marked as <samp>primary-required</samp> should be omitted. If it returned a non-empty value for <samp>preservedusername</samp>, that username must be used for the <var>username</var> parameter.