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.
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Planning and grooming sessions all come with their own sets of rules. Team members meet to estimate stories or other work items, all according to an agreed-upon process. And with every session comes ...
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