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
唔好意思，如果有人唔再係某一個 group 嘅 member，你哋都需要係對方嘅 Telegram 聯絡人先可以將佢加返嚟。
請注意，只要唔喺被移除的用户名單入面，佢仍然可以透過 group 嘅 invite link 返入嚟。
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Tony Wong,
Dec 5, 2021 at 13:46