I have created a CW alarm using a CloudFormation Template which looks something like this

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

The SNS topic has been subscribed to and email has been confirmed.

However in the CloudWatch console it says Pending Confirmation What am I doing wrong? Please help me out.