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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Beklager, hvis en person forlod en kanal, skal du være på deres kontaktliste for at bringe dem tilbage.
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Deleted Account,
May 5, 2020 at 17:59