No success in getting layout to play

I have recently followed your open source “getting started” documentation to stand up an Ubuntu 22.04 LTS Server PC and followed the docker solution to get the basic CMS up and running. This is a test setup as a proof of concept. I am clearly doing something wrong and need to be pointed in the right direction, please.

A separate tester PC is being used as a test display with 1080 resolution display. The display appears to be added and is status (checked), authorised (checked) and logged in (checked), no content I have created in the last 48 hours has ever appeared on the test display. They are on the same small network, both hard-wired ethernet.

While I have tried to follow many online sources, including your manuals and docs to create a layout, have published and scheduled it, nothing ever appears.

I am using version 4.1.2.

Please help.

Think this may have something to do with trying to use the Linux open source display/player and it is not compatible with the 4.1.2 version CMS running in a docker container. Will try the Windoze client/player later this week and see if it makes any difference.