If a person has left athe 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，如果某人退出ㄌ圈圈，尼必須是他ㄉ Telegram 同伴才能將其加回。
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gnehs,
Jan 6, 2022 at 11:05