Jira provides a very generic message saying "Something went wrong" when the SAML response is anything other than successful authentication.

Example: Jira received the below response to an unsuccessful login attempt.

2020-12-09 22:35:37,177-0800 http-nio-8080-exec-13 ERROR anonymous 1355x9604x1 1pqlvb  /plugins/servlet/samlconsumer [c.a.p.a.i.web.filter.ErrorHandlingFilter] Received invalid SAML response: The status code of the Response was not Success, was urn:oasis:names:tc:SAML:2.0:status:Responder -> Access to this resource is not currently available to you. Please contact your supervisor if you have questions.

To this, the page saying "Something went wrong" (screenshot attached) was presented to the user which is not very useful.

Suggestion: We can add the ability to customize the error page to something more meaningful, like who exactly to contact aside from just generically "your Jira administrator"