Unable to upload JUNIT test results to JIRA server using TestAutomation

We are using Zephyr for Jira Server as a Test Management Solution.

Steps -

1) Generated JUNIT xml file

2) Created Task under(Test Automation) using upload option

3) When we execute the task, it is not moving to either passed / failed. Struck in scheduled status.

Could someone suggest any fix or workaround would be much appreciated.

Note : it works initially, but from last one week we are facing this issue.

Attaching JUNIT xml.

Thanks in advance,

Rajesh.