Thanks @macbeth, I had a look and the article doesn’t really offer any more info. I made sure the json file is readable by my user id so I have no idea what else to look for.
I copy/pasted all file paths and the json content so typos shouldn’t be the issue.
I also tried the “HomepageLocation” policy from the example page but to no avail.
I might be stuck with confirming every single AMI for now 