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.
194
抱歉，这只已经决定离家出走了呢…您没办法拉ta回来了…
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Deleted Account,
Aug 6, 2019 at 14:13