Yes, you should contact Adobe support and they can look at your article
file. If you're trying to use DFP as a banner, to be displayed as a
banner, that's not supported. If you are using DFP inside the article
when the full article is displayed, then perhaps there is an issue with
how the banner is added to the article. Either way, you won't be able to
see the DFP ad in the card/grid browse view, it would only be displayed
in the article when you open it up