How to troubleshoot AWS Config remediations issues?

I'm trying to develop custom remediations using SSM documents. In some cases, when it goes wrong I can check it in the System Manager -> Automation console and see what's wrong with the code. But there are some situations where I cannot see anything, and I'm currently stuck in fixing this.

So basically I can only see this error: "Action execution failed" | screenshot_anonymized.png

Then when I look for it I can't find anything on the issue anywhere (System Manager, Cloudwatch, Config, etc...)

Does anyone know what this issue is? And/or a neat little trick to debug this?