TLS 1.2 to become the minimum for all AWS FIPS endpoints by March 31, 2021. This is happening earlier on a service by service based, as explained in the post "AWS is rolling out changes on a service-by-service basis between now and the end of March 2021. For each service, after a 30-day period during which no connections are detected, AWS will deploy a configuration change to remove support for them. "
https://aws.amazon.com/blogs/security/tls-1-2-to-become-the-minimum-for-all-aws-fips-endpoints/