Is there something wrong with Wechat's development document? About getting unionid

according to the picture, when the user does not follow the official account, the user"s openid and UnionID can still be obtained. But the truth is, I can only get openid. Only users who follow can get UnionID (which means there is nothing wrong with the configuration of my open platform). So I want to ask whether this is a document error or is there any other problem? if it is a document error, we have to find another way

Mar.19,2021

the interface has been adjusted at the beginning of the year.
check out the announcement: user unionID gets the policy adjustment. Please update

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