On a EPIC I have a LINK ISSUE button, but when I click nothing happens.
It works when I make same operation on a STORY or FEATURE DESCRIPTION
I also check roles and permission helper, nothing help me
I've managed to reproduce this behaviour - it appears to be related to JRACLOUD-72391
I'm assuming you're on the new issue view on a classic project. The button remains on the new issue view whether the "linked issue" field is shown or hidden, based on the Field Configuration.
To check that it isn't hidden you'll need to be a Jira Admin and then...
^ If hidden, when you unhide it it should allow you to link Epics to other issues.
If you're unsure which Field Configuration to select - an alternative in step 1 is to go to Field Configuration Schemes on the left-hand menu and select the scheme applied to your project - from there, you can select the right Field Configuration for the Epic issue type.
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