If a person has left the 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.
194
抱歉，若成员已退出群组，您无法添加此用户回来。
注意，只要不在“已封禁的成员”列表中，他们仍可以通过群组的邀请链接加入。
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无心ᵝ,
Aug 12, 2023 at 13:53