以下消息发送失败原型来自 Line 官方说明，您可以访问 https://developers.line.biz/en/reference/messaging-api/#error-responses 了解详细内容。
| 失败提示Message | 失败原因Description |
|---|
| Authentication failed due to the following reason: XXX | Authentication failed when the API was called. The reason is displayed for "XXX". |
| Access to this API is not available for your account | Appears when calling an API that you do not have permission to use. |
| Failed to send messages | Appears when the message fails to be sent. One reason this may appear is if the user ID specified doesn't exist. |
| You have reached your monthly limit. | Exceeded the number of free messages.Exceeded your maximum number of additional messages allowed to be sent.For more information about the number of free messages and the maximum number of additional messages allowed to be sent, see Messaging API pricing in the Messaging API documentation. |
| Not found | Unable to get profile information. Consider these reasons:Target user ID doesn't existThe user hasn't consented to their profile information being obtainedThe user hasn't added the target LINE Official Account as a friendThe user blocked the target LINE Official Account after adding it as a friendFor more information, see Consent on getting user profile information in the Messaging API documentation |
| Unsupported message type. | 仅支持文本、图片、视频类型消息；暂时不支持附件类型 |
| 错误信息 | 解释及建议 |
| Landline or unreachable carrier | 该号码无法接收短信，可能是座机号码，或当前运营商网络不可达。请确认收件号码是否为手机号码，并确保该号码所在地区的网络服务正常。如确认无误，请稍后重试。 |
| Message cannot be sent with the current combination of "To" and/or "From" parameters | 短信无法发送，当前的发件号码或收件号码组合不被系统支持。请检查发送号码配置是否正确（例如是否为已授权的发信号码）。如问题持续，请联系我们确认发信通道设置。 |
| Unknown destination handset | 系统无法识别收件人的手机设备，该手机号可能不存在或已停用。请确认收件人的手机号是否仍在使用。如号码已变更，请更新后重新发送短信。 |
| Unreachable destination handset | 收件人的手机暂时无法接收短信，可能处于关机状态、无信号区域或暂时不可用。建议稍后再次尝试发送。如果多次失败，请联系收件人确认手机状态或尝试其他联系方式。 |
| 'To' number cannot be a landline | 短信无法发送至座机号码。请确认目标号码为手机号码。若为座机，请使用电话或其他方式联系。 |
| Unknown error | 系统遇到未知错误，短信发送失败。请稍后重试。如果问题持续，请联系我们提供错误时间与收件号码，以便进一步排查。 |
| 'To' number is not a valid mobile number | 收件号码无效，格式或位数不正确。请检查号码是否包含正确的国家区号和完整的手机号码格式，然后重新发送短信。 |
| Attempt to send to unsubscribed recipient | 收件人已退订短信通知，因此无法接收该消息。如需继续联系，请通过邮件、电话或其他渠道沟通。若收件人愿意重新接收短信，需要先重新订阅。 |
| Message filtered | 短信被运营商过滤，可能因为内容被判定为垃圾信息或包含敏感内容。请调整短信内容，避免包含营销、重复、或敏感词汇后重新发送。如多次被拦截，请联系技术支持优化短信模板。 |
