It is my experience that this device will not work with the current generation AppleTv 4K. I have tried 2 new Apple units and I get a blank screen and a message on my Sony TV that nothing is plugged into the input. Current generation FireTv works Fine.
Three times I have filled out the Tech Support form on their web site. In over two weeks I have never received a reply. I do not like to leave negative reviews. I either leave good reviews or none. This is different.