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.
194
若用户曾离开群组，您需要成为其联系人才能将其加回群组。
只要其不在已移除用户列表中，该用户仍可通过邀请链接加入群组。
59/194
Jess,
Sep 14, 2022 at 04:21
若用户曾离开群组，您需要成为其联系人才能将其加回群组。
只要其不在已移除用户列表中，该用户仍可通过邀请链接加入群组抱歉，若用户退出了频道，只有双向联系人才能将他们加回来（即需双方互相持有对方的手机号码）。
45/194
Nice Giraffe,
Nov 10, 2018 at 15:11