Sorry,You can't add this user as an admin because they are not a member of this group and you can'tare not allowed to add this user as an admin because they are not a member of this group and you are not allowed to add them.
116
抱歉，您无法将此用户设为管理员，因为此用户不在群聊中，且您无权邀请成员。
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Robert Lyu,
May 31, 2020 at 00:47