Hi Melissa, I just checked, and Iteration is not (yet) among the Task attributes that can be tracked using Update From Feed, but instead, perhaps one of these options will meet your needs:
If you set Next Week's iteration tasks This Week, they will be copied over to your.preview.workfront.com on the weekend, so if Task Q looks suspicious, you could log in to your preview environment in real time (eg Next Week) to check/prove that it was a late add. FUN FACT: to expedite the comparison, you could even build a dashboard in "my" that points to the report in "preview"
You could take periodic Baselines (manually, or automatically with our "http://store.atappstore.com/product/create-baselines/">Create Baselines solution) of all Projects whose Tasks are eventally assigned to Iterations, therby locking in whatever Iteration ID was (or was not) on each Task at that time
For maximum accuracy, consider adding a custom parameter to every Iterationable Task with a calculated date parameter (eg Iteration Assignment Date) and a formula such as IF(ISBLANK(IterationID),Iteration Assignment Date,$$NOW)
Regards, Doug Doug Den Hoed - AtAppStore Got Skills? Lend a hand!
https://community.workfront.com/participate/unanswered-threads