I would like to create a Jira automation rule where i should not allow users to save the story or display pop up message if entered story points doesnt match certain criteria
Hello @CK
You cannot use an Automation Rule to prevent an action from happening, because rules are triggered after an action happens. You could use an Automation rule to undo an action, but not to prevent it.
If you want to prevent new issues from being created unless they meet certain criteria, you should add Validators to the Create transition in your Workflow. A Validator can prevent the issue from being saved during the creation step.
Here is a link for the built-in Validators available for a Company Managed project:
If this is for a Team Managed project refer to this instead:
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