We have always streamed EWTN channel on our Roku and selected the United States button. Starting yesterday, the United States button will not play. It just goes back to the EWTN main page. EWTN is streaming on YouTube, so it isn't the content provider. We have deleted the channel, reset the Roku, and added it back in and it still won't play.
The other country buttons play on that channel; just not United States.
You should contact EWTN and ask them about it. They may not even be aware that their Roku channel/app isn't working properly.
I didn't check the Youtube stream of EWTN, but when shecking yesterday, both the Roku and the Live Stream of United States on the EWTN website (https://www.ewtn.com/tv/watch-live) were not working yesterday. Got distracted and forgot to finish posting.
Both of the above are now working today so I think you should be good to go now.