Difficulty Setting up a Simple Email Alert

Hello All,

I am trying to setup a simple email alert that alerts me when the Used Percentage in the report below goes above 90% .

I have followed instructions as per the alerting guide, and I was able to get the report scheduled and sent to the APG Report Data adapter and I was able to see the .xml file that got generated in the Alerting Backend.

I have the below alert defenition , however it does not send out email at all. I am not sure what I am doing incorrectly, any help on this will be appreciated.