To be completed by the original poster:
Xibo Digital Signage Version 3.0.4
The CMS is installed on a VM with Docker Container.
In the network settings of the CMS the SSL options and STS are disabled, the SSL certificate is managed by HAProxy externally from the VM.
The preview of a layout dont work if the layout contain a video. Once i try to use preview function, if i inspect the webpage i see the error: ERROR: Attempted to run Layout ID 148 before it was ready.
The preview of other layouts that not contain a video works well.