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 Removed Users list.
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抱歉，如果某人已不再是群组的成员，您需要成为其 Telegram 联系人才能将对方添加回来。
注意只要对方不在被移除用户列表中，就仍可通过群组的邀请链接加入。
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Fair Leopard,
Mar 21, 2023 at 10:51