My company have a help desk where customers that use our software can log a ticket with us. It used to work so that, if they log a ticket and we put a comment on it, of course they get an email, but they USED to be able to just hit 'reply' on the email and it would add their comment, not forcing them to go to the help desk ticket and type their comment in there. Now, if they hit reply on the ticket, instead of posting it as a comment to the existing ticket, it's opening a new ticket.
Is there a setting that changed that I need to fix in ADMIN?
You need to configure that in Incoming mail handler. There is setting that specifies if to create new issue for every email or add comment to existing issue.
Please follow this KB,
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 ...
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