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我尝试在 iTunes 中添加新用户，但它显示错误消息为“此电子邮件地址已链接到提供商。要继续，请输入其他电子邮件地址。” 但这发生在特定 ID 上。我尝试添加另一个 ID，它工作正常。谁能帮我找到解决方案？