If a person has left the group in the past, you need to be in their Telegram contacts to add them back.
They can still join via an invite link as long as they are not on the group's invite link as long as they are not on the Removed Users list.
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抱歉，若用户已退出群组，只有双向联系人才能重新邀请他们加入（即需双方互相持有对方的电话号码）。
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𝒟𝒶𝓋𝒾𝒹 ℒℯℯ 🥷 ℳ𝓇.,
Dec 27, 2020 at 08:53