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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Sorry, if a cat is no longer part of a group, you need to be in their Telegram contacts in order to add them back.
Note that they can still join via the group's invite link as long as they are not in the Removed Cats list.
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danielle ⋆˚.⋆𝜗𝜚,
Aug 30, 2019 at 16:17