No media player entity

I have installed the latest update (both satellite service and client), it's connected to HA instance and works well, except I don't get any media_player entity in my HASS.Agent device. This was broken for me before the update was installed and the update hasn't fixed it, I tried restarting PC, restarting HA (running on rPI), disabling and enabling media player functionality and nothing works.
Additionally, when trying to consult media player documentation, I get 404 error.

Can I do something about this? Do you need more info?