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A 403 error encountered after federated login with AWS Client VPN typically signifies a misconfiguration in the SAML identity provider (IdP) response or the absence of required attributes expected by AWS. Administrative privileges within AWS do not override this behavior, as successful authentication relies on the IdP (such as Azure AD, Okta, or Google Workspace) delivering the correct SAML assertions. According to AWS documentation, the SAML response must include at least one attribute, and the Client VPN authorization rules must align with the group claims provided by the IdP.
https://docs.aws.amazon.com/vpn/latest/clientvpn-admin/missing-attribute.html
https://repost.aws/questions/QU5T9pXuYaTv2OkN6zUOqJmg/client-vpn-federated-connection
https://docs.aws.amazon.com/vpn/latest/clientvpn-admin/troubleshooting.html
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