Trouble assigning a CW Event Rule that's created in CF

Serverless Framework
,
1

Got a problem…trying to create a trigger on a Lambda with a Resource I’m creating in the resources section. I’m using this trigger multiple times, so I don’t want to create it using the inherent method in Serverless Framework.

The CW Rule shows that it’s supposed to trigger the lambda. When you go to the Lambda, that trigger isn’t actually getting applied.

Could someone please look at the code and advice any modifications to get it to work?
Thanks!

functions:
  EventMonitor:
    handler: event_monitor.handle_event
    environment:
      CF_StateMachine: arn:aws:states:${opt:region}:${self:custom.commonVariables.us}:stateMachine:ScannerDeploy
    events:
    - cloudwatchEvent:
      arn:
        Fn::GetAtt:
          - EC2RunInstancesTriggerRule
          - Arn
  
  resource:
    Resources:
      EC2RunInstancesTriggerRule:
        Type: "AWS::Events::Rule"
        Properties:
          Name: ${self:service}-EC2RunInstancesTrigger
          Description: "Triggers StateMachine:cannerDeploy upon CW Event: RunInstances"
          State: ENABLED
          EventPattern:
            source:
              - aws.ec2
            detail-type:
              - AWS API Call via CloudTrail
            detail:
              eventSource:
                - ec2.amazonaws.com
              eventName:
                - RunInstances
          Targets:
            -
              Arn:
                Fn::GetAtt:
                  - EventMonitorLambdaFunction
                  - Arn
              Id: "EventMonitor"