DNS change by device

My router is currently using my ISP‘s DNS server but for the longest time I have been using a different one on my Apple TV 4K. I decided to change it on the Apple TV. All I did was go into Settings, Network, Ethernet and then I went down to Configure DNS and changed it from Automatic to Manual. Then I’d go below and I put the one I wanted to use. Once done I’d hit Done. I’d then unplug the cord from the box and wait 30 seconds, plug it back in and let it restart. I’d then go back and check to see if it stayed. Which it would. Now im having trouble using that method. Have they changed the way it works??