CloudWatch 警报：待确认

Question

我使用 CloudFormation 模板创建了一个 CW 警报，如下所示

MyAlarm:
 Type: AWS::CloudWatch::Alarm
 DependsOn: CodePipelineSNSTopic
 Properties: 
  ActionsEnabled: TRUE
  AlarmActions: 
    - !Ref CodePipelineSNSTopic
  AlarmDescription: DynamoDB-Alarm
  AlarmName: DynamoDB
  DatapointsToAlarm: 1
  Dimensions: 
    - 
      Name: TableName
      Value: APIGroups
  ComparisonOperator: GreaterThanOrEqualToThreshold      
  EvaluationPeriods: 1
  MetricName: ConsumedWriteCapacityUnits
  Namespace: AWS/DynamoDB
  Period: 300
  Statistic: Average
  Threshold: 1

SNS主题已订阅，电子邮件已确认。

然而，在 CloudWatch 控制台中，它显示Pending Confirmation我做错了什么？请帮帮我。