Ashley_Fawcett

Yes the job fails. I have opened a ticket as I think there are issues with our instance. Thanks for your help though!

It isn't the lead id i'm using, its a unique id we assign to people in customers, but I've tried both ways and now have double the leads

Yes, I map both email address and a user ID that should technically map it to the existing lead. It creates a new on every time and when I try to skip new people and updates it fails.