Problem

When a user creates a new project, all steps work correctly until clicking Submit. Then the page redirects to an error:

This project isn't available

It may have been deleted or your permissions may have changed.

Diagnosis

Diagnostic Steps

• In JIRA Admin > Issues > Permission Schemes verify which groups and/or Project Roles have the 'Browse Projects' Permission.
• In JIRA Admin > System > Roles check which users are by default in Project Roles with the 'Browse Projects' Permission.
• See if the created projects are visible under  JIRA Admin > Projects. 

Cause

The projects are created, but the user(s) creating them don't have the permission to browse them.

Resolution

• Edit the Default Permission Scheme to grant 'Browse Projects' permission to more users/groups/Project Roles.
• Add default members to Project Roles with the 'Browse Projects' permission.
• Manually edit the Project Roles in a particular project to grant the users access to browse it.