问签名验证失败,帮看看是什么原因？

大神们您好，按一下报文提交，报错，是严格按文档做的签名，麻烦帮看看是什么原因

url:https://api.tpns.tencent.com/v3/push/app

AccessId:1500012731

TimeStamp:1599535446

Sign: 4lnR8xKCOKR6Mauq13RX2aKUTgM18mq1thovhC15Kps= {"audience_type": "account","platform": "android","message": {"title": "test title","content": "test content","android": { "action": {"action_type": 3,"intent": "xgscheme://com.xg.push/notify_detail?param1=xg"}}},"message_type": "notify","account_list": ["5822f0eee44c3625ef0000bb"] } 接口返回信息 {"audience_type": "account","platform": "android","message": {"title": "test title","content": "test content","android": { "action": {"action_type": 3,"intent": "xgscheme://com.xg.push/notify_detail?param1=xg"}}},"message_type": "notify","account_list": ["5822f0eee44c3625ef0000bb"] }