When using Web Identity Federation, what is the first step?

In the process of utilizing Web Identity Federation, the initial step involves the user authenticating with a web identity provider, such as Facebook, Google, or Amazon itself. This authentication is critical as it verifies the identity of the user trying to access the AWS resources. After the user successfully logs in using their chosen provider, they are issued an ID token, which can then be used to interact with AWS services securely.

The flow of Web Identity Federation starts with user authentication, as this step is foundational for obtaining temporary security credentials that allow the user to assume a role in AWS. Without this authentication phase, the system cannot generate the ID token that is essential for making subsequent API calls, such as AssumeRoleWithWebIdentity, or for obtaining temporary credentials. Consequently, this makes user authentication the first and essential step in the process, setting the stage for all further actions within Web Identity Federation.