Please make the
emails of your recipients
box in the notification section of a pipeline able to perform expression resolution.
Pipeline -> notify -> new notification -> on failure -> email -> <+expression of user email based on who approved something in the pipeline>
<+pipeline.stages.Run_terraform.spec.execution.steps.HarnessApproval_1.output.approvalActivities[0].user.email>
This could be as easy as removing or changing a regex validation for the box.