Websocket connection works on localhost, but get 403 error when deployed via docker

Questions & Help Questions
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1

For some reason my phoenix channels are working for me in my local dev environment, but as soon as I deploy via Docker, I get a 403 error:

WebSocket connection to 'wss://web.my-app.convox/socket/websocket?userToken=726&vsn=1.0.0' failed: Error during WebSocket handshake: Unexpected response code: 403

I have also tried ws:// instead of wss:// and got the same result.

I used to have BasicAuth running in my app, but I have removed it.

My user_socket.ex file is as follows:

defmodule MyAppWeb.UserSocket do
	use Phoenix.Socket

	## Channels
	channel "vw:*", MyAppWeb.VowpalWabbitChannel

	## Transports
	transport :websocket, Phoenix.Transports.WebSocket, check_origin: false

	def connect(_params, socket) do
		{:ok, socket}
	end

	def id(_socket) do
		nil
	end
end

What can i do to connect to my websocket in a non-dev environment?

Thanks.