'Blank banners displayed in MC and Top

My client Land Rover DE (71640) has some supplied 3rd party HTML banners in place. These are being displayed blank in MC and Top for everyone.

In design tool and a sandbox I used to check the code they have been displayed properly a few days ago, but cant be displayed any more now. And the client is claiming they are working on their side. When I got myself retaregeted yesterday in a life environment, the banners were blank as well, but we could see some clicks when the campaign was live.

When checking the banners I can see that the server is not responding to us enter image description here But the client claims it is alright from their side.

They do have geolocation filters for Germany in place. And the tags are set up in a way that they only fire when someone clicks the banner.



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