Permission errors while executing post-functions
Problem
Some of your post-functions do not seem to be working at all, and in the logs (accessible from the Troubleshooting and support for JIRA Misc Workflow Extensions page) you find errors such as unauthorized or You do not have the permission to see the specified issue.
The post-function is operating on;
a project that has a non-standard Permission Scheme (such as a Service Desk project) or is using a Security Scheme
an issue that has a security level set or
a transition that has a workflow property set which restricts the "Run as" user from seeing/editing the issue
Solution
Visit the Verifying your JIRA instance after installation page for a list of possible JIRA configuration issues.