Display won't show the video with a Overlaylayout

I’m trying to schedule an Overlaylayout vie REST, the problem is that every display which is scheduled, won’t show anything.
It won’t change from the Default-Layout to my new created Overlaylayout.
The video is in a embedded HTML code, because at the end of the video an HTTP post request is sent to let my backend know that the video is over.
The Layout is also added from the backend-server, so the Layout can’t be marked as valid, because the Layout could change on runtime anytime.

Here you can see all my Layouts, when the video ends, the on-demand Layout will be deleted by the backend-server, when the video ends.

If you want the layout, please contact me private and I’ll send you the link to the Google Drive Folder.
Thanks in advance.

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