Let’s Encrypt may work with your CDN. However, its success will depend on how the CDN is configured on your account.
Note that you cannot secure a CDN’s content unless you are the owner of the CDN. In order to secure the content, the CDN’s owner would need to generate and install an SSL certificate on the CDN.
You can protect the traffic between the hosting account and the CDN by using a Let’s Encrypt certificate. CDN configurations may vary and can cause the automatic generation of a Let’s Encrypt certificate to work incorrectly.
In order to ensure your configuration is set up correctly, we suggest that you contact our support team for assistance. They will be able to assess your configuration and give you insight into what steps are necessary to set up Let’s Encrypt.