Have you ever run into a message on your Display & Video 360 widget "Quota exceeded in the google-dv360 integration. Please try later"? This happens because everyone has a certain user quota for DV360. If you use a lot of widgets for this integration in a day, this error message can occur.

Unfortunately, in this case, we can't do much. You need to reach out to Display & Video 360 customer support to increase the user quota for your account. You can do that here.