无法从 EventBridge 发布消息到 SNS 队列

Question

假设一个 SNS 主题配置了“默认”访问策略，如下所示：

{
  "Version": "2008-10-17",
  "Id": "__default_policy_ID",
  "Statement": [
    {
      "Sid": "__default_statement_ID",
      "Effect": "Allow",
      "Principal": {
        "AWS": "*"
      },
      "Action": [
        "SNS:GetTopicAttributes",
        "SNS:SetTopicAttributes",
        "SNS:AddPermission",
        "SNS:RemovePermission",
        "SNS:DeleteTopic",
        "SNS:Subscribe",
        "SNS:ListSubscriptionsByTopic",
        "SNS:Publish"
      ],
      "Resource": "arn:aws:sns:us-east-1:############:NotificationTopic-test",
      "Condition": {
        "StringEquals": {
          "AWS:SourceOwner": "############"
        }
      }
    }
  ]
}

CloudWatch 警报可以发布到这个主题。 EventBridge 规则不能发布到此主题。

EventBridge 是否需要带有“Principal”的 SNS 访问策略：{“Service”：“events.amazonaws.com”} 而 CloudWatch 不需要？如果是这样，为什么？