小程序获取accessToken 48001 api unauthorized, hints ？

接口：https://api.weixin.qq.com/sns/oauth2/access_token?appid=wx15fc601dfc580dc7&secret=xxxx&code=xxx&grant_type=authorization_code

appid：wx15fc601dfc580dc7

响应结果：{"errcode":48001,"errmsg":"api unauthorized, hints: [ req_id: WfFEGiqNe-kN.Q_ ]"}