Forbidden error with Cloudfront CDN

Hi,

I am trying to setup a Cloudfront CDN.
However, I get an error as you can see here : https://deya3mlcjkmrf.cloudfront.net/
It seems to be related to hosting software configuration i.e Grav or ServerPilot

I run on nginx (check below), so it can't be a .htaccess issue.
I suspect ServerPilot and a missing config on it, but i didn't find anything about it.

Any idea?

My Website config :

EC2 + ServerPilot + PHP7

Amazon Machine Image (AMI)
Ubuntu Server 20.04 LTS (HVM),EBS General Purpose (SSD) Volume Type. 64 bits (x86)

EC2 instance type
t2.micro

Web server
Nginx

https://github.com/getgrav/grav/issues/3413