It should be that you have not enabled adding friends and need to pass the verification.
How to turn on the friend verification function?
Open WeChat and click "Settings".
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Select "Privacy" in the settings interface.
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Verification is required when adding me as a friend " of Just turn the switch on.
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Reference: /kf. qq.com/faq /161223MnERJb161223vUviEv.html"target="_blank"title="Only supports selecting a link to take effect">WeChat: Help and feedback: WeChat settings need to be verified when adding friends