Add-ons for JIRA Cloud are supposed to be Atlassian Connect . There is nothing that technicaly prevent this plugin to be available for JIRA Cloud but as it is not an Atlassian Connect add-on the decision it up to Atlassian :
– Cloud applications come with a set of bundled add-ons that can be enabled or disabled at any time.
I will try to get more information, meanwhile you can send the same message directly to Atlassian , i think there are no others ways at the moment.
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