Subdomain error - Prestashop 1. 7.8.5

[Mathew Nwaneri]

Good day colleagues, 

I kindly ask if someone can give me a hand to understand how to solve the case below:

I tried to use a CDN subdomain to serve images on my prestashop site.
I have configured the subdomain on cloudfront with my source domain pointing to the path where I have my image content: /public_html/img.
I also tried the cloudfront configuration using my subdomain with no additional path.
I also created a cname with the cloudfront distribution domain name on both my domain and my subdomain.
Unfortunately when I put my subdomain in the prestashop mediaserver setup, my site becomes unusable, both theme configuration and images disappear.

I have also tried creating the subdomain without cloudfront pointing directly to the images path and still get the same result, both configurations give me a 403 error.
I use cloudflare and have created an A record for it with the grey cloud.
Reading on the forums, I understood that it is better to contact the hosting for a possible solution, which I did but they could not find the source of the error.

I have other subdomains that work perfectly as desired except this one which points to the img folder.
What I need to resolve is the 403 error I get using the subdomain.

Thanks to anyone who can give an idea on how to solve it.