Why: Your Request Included an Invalid SAML Response – AWS
If you recently configured Single-Sign-On (SSO) for Amazon Web Services (AWS), you may receive an error message while attempting to log in or while logged into the AWS console.
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Your request included an invalid SAML response. To logout, click here.
Ensure you have created an AWS IAM role and an Active Directory group with the same name. Finally, ensure you added all active directory accounts (that are AWS administrators) with the same role to the group.
For more information, refer to AWS technical documentation here.
For more information on how to configure SAML, refer to this AWS document.