Cannot attach SSL certificate got form Let's Encrypt

I have got my SSL certificate from Let's Encrpyt. I have uploaded it to the ACM and am able to see my domain there. I have uploaded it to the CloudFront and while adding the Alternative domain name am getting this error "The certificate that is attached to your distribution was not issued by a trusted Certificate Authority"

https://aws.amazon.com/blogs/networking-and-content-delivery/continually-enhancing-domain-security-on-amazon-cloudfront/ https://ccadb-public.secure.force.com/mozilla/IncludedCACertificateReport

These are the documentations for the trusted ssl providers by Amazon, My domain has been issued by the Let's Encrypt ( E1 ). While checking the above documentation if my issuer is trusted ,
Let's encrypt is not given in Certificate Issuer Organization , but "Internet Security Research Group" this organization has its website name as https://letsencrypt.org/ .

To eloborate ,the organization "Internet Security Research Group" in the column Certificate Issuer Organization has ** https://letsencrypt.org/** in the Company Website column

Am super confused , is Let's Encrypt authorized by AWS or am I missing anything ?