Hi,
TLS 1.2 is still supported but we recently rolled out a new CDN which limits the TLS ciphers we support. [Change] Infrastructure (CDN) rollout and potential new 400 & 403 errors
This is the page which lists the supported ciphers: Supported protocols and ciphers between viewers and CloudFront - Amazon CloudFront
Apologies, I’m not too familiar with Windows Server, but there might be a way to configure preferred ciphers? This might not be relevant, but something I found: Manage Transport Layer Security (TLS) in Windows | Microsoft Learn