Hello,
This is not a usual hardware behavior therefore we do not have a list of troubleshooting steps that I can provide you with. I had to investigate and based on the result of one test we can suggest another step.
In your case I see that the problem may lie within the speakers that are connected to the docking station. Please un-plug the speakers and check if you can get the HDMI audio working.
The configuration that has been created for your docking station has headphone privacy - which means that if there is anything plugged into the analogue audio output it will mute all of the other outputs.
Best regards,
Katarzyna
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