https://developers.weixin.qq.com/doc/offiaccount/Subscription_Messages/api.html

在【用户管理订阅通知】事件推送的示例中如下：

<xml>
    <ToUserName><![CDATA[gh_123456789abc]]></ToUserName>
    <FromUserName><![CDATA[otFpruAK8D-E6EfStSYonYSBZ8_4]]></FromUserName>
    <CreateTime>1610969440</CreateTime>
    <MsgType><![CDATA[event]]></MsgType>
    <Event><![CDATA[subscribe_msg_change_event]]></Event>
    <SubscribeMsgPopupEvent>
        <List>
            <TemplateId><![CDATA[VRR0UEO9VJOLs0MHlU0OilqX6MVFDwH3_3gz3Oc0NIc]]></TemplateId>
            <SubscribeStatusString><![CDATA[reject]]></SubscribeStatusString>
        </List>
    </SubscribeMsgPopupEvent>
</xml>

该消息内容里的【SubscribeMsgPopupEvent】标签名和【用户操作订阅通知弹窗】里的一模一样，也是【SubscribeMsgPopupEvent】。怀疑此处按照规范应该是【SubscribeMsgChangeEvent】。。。下一个事件推送项【发送订阅通知】里的内容与【Event】标签内容也对的上