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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        сОРРЫ, ИФ А ПЕРСОН ЛЕФТ А ЦХАННЕЛ, ОНЛЫ А МУТУАЛ ЦОНТАЦТ ЦАН БРИНГ ТХЕМ БАЦК (ТХЕЫ НЕЕД ТО ХАЖЕ ЫОУР ПХОНЕ НУМБЕР, АНД ЫОУ НЕЕД ТХЕИРС).
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            Zetroks Roksi,
            Sep 25, 2021 at 14:11