Some JIRA instances have a "Participant" field from other plugin's that is different from the "Request Participant" field that JIRA ServiceDesk uses. Can you confirm that you added the customers as a "Request Participant" to the issue?
The second thing to check would be to ensure that your customer's email/account is listed in your "Customers" role on your project, or that they are part of a group that is listed within that role.
If these two things are set correctly, then the customer should be able to log in to the customer portal to make a comment, or reply to an email to add a comment.
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs
We're bringing product updates and pro tips on teamwork to ten cities around the world.Save your spot