It is always ON by default now.From 2.9 release notes:
Remote API setting always on
We removed the Remote API setting from the Server Settings page. From this release onwards the Remote APIs will always be accessible, to make the JIRA integration straightforward.
...word of mouth, so by 2016, we were working with several other entities on campus to implement Jira Service Desk . The Atlassian motto of “for every team” has really come true for us in this case. We...
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