It's not a built-in function, so one of your administrators has disabled or removed the add-on providing it.
If you are on Cloud, that would be consistent with Atlassian's gradual removal of some of the standard add-ons they're trying to get rid of (Misc Extensions, JIRA Suite, Toolkit etc)
Hello, Community! My name is Gosia and I'm a Product Manager on Jira Server and Data Center here at Atlassian. Since 2002 when we launched our public issue tracker, jira.atlass...
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