记得哪个文档中写了这个接口，也适用于unionid。记得之前测试的时候成功过，这次传unionid，返回报错不合法的openid
1.公众号、小程序已绑定到开放平台
2.access_token是有效的
3.用unionId调用时参数名用【openid】或【unionId】都试了，都调不通
如果不行的话，还有什么办法，可以通过unionid来查询该用户是否关注了公众号呢。
我的需求是：用户登录了小程序后，我要判断是否关注了公众号
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https://developers.weixin.qq.com/doc/offiaccount/User_Management/Get_users_basic_information_UnionID.html#UinonId