使用消息推送客服方式，小程序发送图片给客服后，服务端收到抖音后台的推送，消息格式如下：

{"msg":"{\"ToUserName\":\"tt17b861058883b539\",\"FromUserName\":\"wLq8F1-QZzyShArc\",\"CreateTime\":1669608405005,\"MsgType\":\"image\",\"PicUrl\":\"https://p6-imcloud-sign.byteimg.com/tos-cn-i-0000c2347/e7fd4c77d71744fda6f6b6440023ee78~tplv-4q3nkbmfbv-image.image?x-expires=1669867604\\u0026x-signature=5ef87lOelFf54dLJ%2F2A1%2Bdw5fc4%3D\"}","msg_signature":"157e0917c21314439ac2ced05833b530a78a1eca","nonce":"6251","timestamp":"1669608405"}

其中PicUrl的url是访问不到的，请求返回403，请问哪位大神有遇到过吗，怎么处理？