my humble thought is that you probably have nothing to change in the config, as we both have the exact same setup, this likely to be something else.
What you can try is what Niels describes in his table to check if you are in the same case, it seems to work with DLNA. So try to install a DLNA server on an android phone or compute, then install the DLNA service, and check if you can play this media source on the Luxe.
You could also try if you still have the issue on a different LAN.