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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如果某人已经离开过频道，你需要是他的 Telegram 联系人，才能邀请他加入频道。
只要他们不是已移除用户，他们仍然可以通过邀请链接加入。
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agou 🏳️⚧️,
Aug 27, 2022 at 07:20