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HTTP_STATUS_UNAUTHORIZED
AWS documents 561 when a listener authentication rule is configured and the identity provider returns an error while authenticating the user. It is not the standard HTTP 401 status.
Check the load balancer access logs for the reason code, then verify the identity-provider configuration, redirect URI, client credentials, and the user authentication flow.
For the AWS Application Load Balancer use represented here, 561 is not the standard 401 status and points to an authentication integration failure involving the configured identity provider. Inspect load-balancer authentication logs, provider reachability, and provider response details rather than assuming that the application target itself rejected the user credentials.
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