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，如果一位用户主动退出了频道，只有双向联系人可以将其添加回来（双方都需要有对方的手机号码）。
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呆瓜 🍧,
Oct 9, 2019 at 23:26