Goal: Send a weekly automated message that says how many days are left in the sprint.
Attempt to Solve:
{{now.diff(issue.created).weeks}} works great as spelled out in the documentation.
However, I'm unable to get a result when I'm trying to access the sprint end date of an issue.
Below is my workflow

I get a value for {{now}} and I get a value for {{lookupIssues.get(0).customfield_100016.endDate.jiraDateTime}}, but the 3rd audit log value that is doing the date diff is blank.
I tested doing {{now.diff(lookupIssues.get(0).created).weeks}} and it properly returned a value.
So why can't the Sprint End Date be used for the date diff?
Or is there a better way to reach the goal?