企业微信接口升级后，根据微信开放平台获取的unionid和openid，调企微转换external_userid接口，
返回{ errocde=0，errmsg=“ok”,external_userid=[]}，用户已存在于企微家校通讯录中。
请问是什么原因？
新授权企业，微信用户转external_userid提示成功，但外部联系人id返回为空，什么原因？For a newly authorized company, the WeChat user transfer to external_userid is successful, but the ID of the external contact is empty. What is the reason?
新授权企业，微信用户转external_userid提示成功，但外部联系人id返回为空，什么原因？企业微信接口升级后，根据微信开放平台获取的unionid和openid，调企微转换external_userid接口，
返回{ errocde=0，errmsg=“ok”,external_userid=[]}，用户已存在于企微家校通讯录中。
请问是什么原因？
After upgrading the enterprise wechat interface, adjust the enterprise wechat to convert external according to the unionid and openid obtained by the wechat open platform_ The userid interface returns {errocde = 0, errmsg = "OK", external_userid = []}. The user already exists in the address book of the enterprise, micro family and school. What is the reason?
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