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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若用户曾离开群组，您需要成为其联系人才能将其加回群组。
只要其不在已移除用户列表中，该用户仍可通过邀请链接加入群组。
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Fair Leopard,
Mar 21, 2023 at 10:51