Can I ask you to confirm which Jira version you are currently running? The latest release of the Jira Server for Slack integration is compatible through Jira 8.13.2. Although Jira 8.14 has been released (and the integration isn't listed as compatible yet), it's not two months old.
If you are on an 8.13 version and the app isn't working for some reason, can you let me know which specific functionality isn't working right?
Daniel | Atlassian Support
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