Final Answer:
To use an ACM cert with CloudFront, it must be created in the US East (N. Virginia) region.
Step-by-step explanation:
Amazon CloudFront, the Content Delivery Network (CDN) service provided by Amazon Web Services (AWS), requires the SSL/TLS certificates used for secure connections to be managed by AWS Certificate Manager (ACM). When using an ACM certificate with CloudFront, it's important to note that the certificate must be created in the US East (N. Virginia) region. CloudFront distributions that use ACM certificates are associated with the specific region where the certificate is created.
This regional requirement ensures proper integration and functionality between ACM certificates and CloudFront distributions. While AWS services often offer flexibility in choosing regions, the association of ACM certificates with CloudFront is region-specific.