Confirmation Page doesn´t load in Iframe


I got a (hopefully) symple question:
We made a page for our affiliates with a gravity form in it and used an Iframe to display it on a third-party domain. So some weeks ago the confirmation-page was loading in the iframe after submission of the form, as intended.
So now, some weeks later I try to get trough the form and the confirmation page isn´t loading in the Iframe. If I normaly open the page, which is shown in the Iframe, everything works fine.

Any ideas what I can do?

Can you send a URL to the page where we can see the confirmation?

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Here for example:
And this should be the confirmation:

any ideas what i can do?