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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对不起，如果一个人离开了一个群组，只有相互联系才能让他回来(他们需要你的电话号码，你需要他们的电话号码)。
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Deleted Account,
Jan 6, 2022 at 12:47