Glenn

I realised that adding the `*` does not have the intended effect of targeting all Values. Will need to take a second look at it 

Made some changes based on the example at [AWS docs: Register targets using a group of tag keys (without tag values)](https://docs.aws.amazon.com/systems-manager/latest/userguide/mw-cli-tutorial-targets-examples.html#mw-target-example-3) and the solution works now. Example snippet: ```yaml MaintenanceWindowTargetEC2:...

LGTM 🚀. Please update the PR description at the top with the latest test results.