Captivate 9 - Vimeo Embedding - Internet Explorer using the wrong player?

Hello,

we are creating e-learning courses with Captivate and publish them as HTML5.

An issue arose with one of our customers where the loading times for the videos are pretty high so we decided to upload the videos to Vimeo as it is using a CDN.

The videos we are using are transitions from one location to another and are triggered by interactive buttons in the course itself.

So the videos are supposed to play without any control interface or icons visible - therefore we are using web objects to embed the videos with the "background=1" switch which completely disables the control interface.

When I preview the course this is working fine in Edge, Firefox and Chrome - the only problem is with the Internet Explorer which is using the Flash Player instead of the Vimeo Player which due to the embed link it should use.

Unfortunately the Internet Explorer is the main browser used by our customers and the Flash Player in this case is not an option.

The strange thing is that the IE is using the correct player when I put the embed link into a HTML file for testing purposes and open it directly in IE so it only seems to use the wrong player when the course comes out of Captivate.

I´d appreciate any help in this case as tbh I´m stuck on this one.

Thanks and kind regards

Oliver