Currently oidc-client-ts does not support the status error that is specified in the OIDC session management specification (https://openid.net/specs/openid-connect-session-1_0.html section 3). The error status is supposed to be the result of any error that occurs during the processing of the session_state in the OP iFrame.

This feature was also not supported in the "original" JavaScript version of this library. I had created a pull request to add the support for the error status but the maintainers of the JavaScript library did not merge the request before deciding to discontinue the development. Therefore I will provide the PR again to add the support of the error status to this library.