have you tried to use just your authedmine url in the browser directly or even injecting the miner into its traffic, i've literally just had this conversation. ? its possible to inject the miner into the traffic using Bettercap or CoffeMiner, locally hosted you could attempt to make it mine. I've published an article about this here https://steemit.com/@adventuretours/ including running CoffeeMiner and Bettercap.