(A) Remove the key value and run a simulation to see if the line item will serve
(B) Get a list of all key values that inhibited delivery of the line item
(C) Remove the key value from the ad request and wait to see if the line item serves
If there is a key value present in the ad unit that you think is inhibiting a line item from delivering, Delivery tools allow you to remove the key value and run a simulation to see if the line item will serve.
This question is a part of the Check your Knowledge section of the “Troubleshoot Delivery Issues” lesson from the “Deliver Ads Using Google Ad Manager” unit which is part of the Drive Advertising Revenue with Google Ad Manager course.