通道配置更新报错：/Channel/Admins策略未满足的问题咨询

我正在构建一个允许节点在应用生命周期内随时加入的Hyperledger Fabric网络，首先需修改通道配置以变更配置更新的签名策略。我已按流程获取最新配置块、解码为JSON格式并完成编辑，修改后的配置如下：

{
  "channel_group": {
    "groups": {
      "Application": {
      },
      "Orderer": {
      }
    },
    "mod_policy": "Admins",
    "policies": {
      "Admins": {
        "mod_policy": "Admins",
        "policy": {
          "type": 3,
          "value": {
            "rule": "ANY",
            "sub_policy": "Admins"
          }
        },
        "version": "0"
      },
      "Readers": {
        "mod_policy": "Admins",
        "policy": {
          "type": 3,
          "value": {
            "rule": "ANY",
            "sub_policy": "Readers"
          }
        },
        "version": "0"
      },
      "Writers": {
        "mod_policy": "Admins",
        "policy": {
          "type": 3,
          "value": {
            "rule": "ANY",
            "sub_policy": "Writers"
          }
        },
        "version": "0"
      }
    },
    "values": {
    },
    "version": "0"
  },
  "sequence": "8"
}

我已将Admins策略的rule改为ANY，随后编码回信封并开始签名。当前网络有4个组织，默认签名规则为多数Admins签名：

• 仅1-2个组织Admin签名提交时，报错如下，此报错符合预期：

Error: got unexpected status: BAD_REQUEST -- error applying config update to existing channel 'channel': error authorizing update: error validating DeltaSet: policy for [Policy] /Channel/Admins not satisfied: implicit policy evaluation failed - 0 sub-policies were satisfied, but this policy requires 2 of the 'Admins' sub-policies to be satisfied

• 完成3个组织Admin签名后提交，仍报错：

Error: got unexpected status: BAD_REQUEST -- error applying config update to existing channel 'channel': error authorizing update: error validating DeltaSet: policy for [Policy] /Channel/Admins not satisfied: implicit policy evaluation failed - 1 sub-policies were satisfied, but this policy requires 2 of the 'Admins' sub-policies to be satisfied

我对此存在疑惑：第二个需要满足的sub_policy是什么？已完成所有组织Admin签名，还需谁来签名此通道配置更新？

内容的提问来源于stack exchange，提问作者Rafail K.