If a person has left a channel 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，如果有人離開了群組，您必須是他的聯絡人才可以把他們加回來。
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𝓓𝓸𝓻𝓪𝓶𝓲 2F6FBA1D 🇹🇼,
Jun 26, 2019 at 17:44