This video will help you process videos that are failing to generate when you have a LinkedIn background URL.
Disconnect your current Cookie
Head to LinkedIn and access YOUR PROFILE from your menu
Right click on an empty space and access your inspect tools
Click on APPLICATION header and look for the LINKEDIN cookie on the left hand side panel
Right click it and hit CLEAR
Log back in to LinkedIn and look for the new COOKIE.
Copy that and paste it in your Dynamic Video campaign
Try to generate the video again