Issue Summary

After upgrading to Jira Data Center 8.10.x and version 4.1.0 of SSO for Atlassian Server and Data Center, users cannot log in.

Steps to Reproduce

This is based on information from the customer, Jira team was not able to reproduce it

1. Have a Jira Data Center 8.9.0 instance with SSO for Jira Data Center 4.0.2.
2. Upgrade Jira Data Center to 8.10.0
3. Upgrade SSO for Jira Data Center to supported version 4.1.0, which adds support for Just In Time user provisioning

Note: JIT user provisioning is not configured before or after the upgrade.

Expected Results

The upgraded plugin operates as normal, users can log in.

Actual Results

Users cannot log in.

The below exception is thrown in the atlassian-jira.log:

2020-07-20 15:53:01,400+0000 http-nio-8080-exec-117 ERROR anonymous 953x39481x1 xxxxxxx .xxx.xxx.xxx.xxx,xxx.xxx.xxx.xxx,xxx.xxx.xxx.xxx /plugins/servlet/oidc/callback [c.a.p.a.i.web.filter.ErrorHandlingFilter] Received SSO request for user preferred_username, but the user does not exist
com.atlassian.plugins.authentication.impl.web.usercontext.AuthenticationFailedException: Received SSO request for user preferred_username, but the user does not exist

Workaround

Revert to an earlier version of SSO for Jira Data Center. Version 4.0.2 has been known to work as expected and can be downloaded from the app versions page.