EC2 Lifecycle Manager event doesn't trigger Cloudwatch rule

I'm using the Lifecycle Manager to generate hourly snapshots of one of my test instances (Running Windows Server 2012 R2).At the same time I created a Cloudwatch rule to listen to these snapshot creations and save the result to a Log Group.

The rule preview:

{"source": ["aws.ec2"  ],"detail-type": ["EBS Snapshot Notification"  ],"detail": {"event": ["createSnapshot"    ],"result": ["succeeded"    ]  }}

The hourly snapshot creation works fine, but the rule is never triggered.In the documentation it says that the logs are not saved anywhere so I need these rules so I can review them later.Am I doing something wrong or is there any other way to do this?

Edit: If I create a snapshot using any other tool the rule is triggered correctly.