The detection rule identifies and alerts on failed attempts to exchange an AuthReqId for an access token in the context of Client-Initiated Backchannel Authentication (CIBA) using Auth0. Threat actors may exploit the CIBA flow by sending manipulated or stolen authentication request IDs, which could lead to unauthorized access. This rule specifically captures the negative outcome of the token exchange process, providing insights into potential misuse of the protocol. By monitoring these failed exchanges, the system can detect expired or invalid authentication requests or attempts by attackers attempting to bypass secure authentication mechanisms. The logic is implemented in Splunk, where the `get_authentication_data_auth0` function filters events based on failure messages logged in relation to CIBA exchanges. Fields such as _time, host, user, signature, and geographic data are collected to enrich alerting capabilities and facilitate analysis.