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 group's invite link as long as they are not on the Removed Users list.
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抱歉，如果有人不再是某個群組的成員，您們都需要是對方的 Telegram 聯絡人才可以將其加回來。
請注意，只要不在被移除的用户名單中，他仍可以透過群組的邀請連結再次加入。
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Tony Wong,
Dec 5, 2021 at 13:45