For a company-managed project in Jira Cloud sandbox environment, I need an automation rule such that when card B is dependent on card A, and card A changes the due date then card B due date is updated by the same number of days. I've read a few posts on this and can't get it to work. Attached are screen prints of the rule I have that "runs successfully" but all it does is blank out card B's date.
Rule: 

