The installation guide to Jira plus plugin in freshdesk supports only JIRA cloud.
for the JIRA server edition there is no way to get API key whih has become mandatory in JIRA PLUS plugin.
However this problem wasn't in the previous version .
Could someone help in using the new JIRA PLUS for Jira server edition .
You might have to contact the JIRA support team to get the API key for your JIRA plus server edition.