CircleCI appears to be having an outage. 421 error code displayed when navigating to app.circleci.com. Redirects from circleci.com are displaying a 500 status code.<p>Their status page still says all systems are operational
Terraform's registry is showing the same thing: <a href="https://registry.terraform.io/" rel="nofollow noreferrer">https://registry.terraform.io/</a>