I’ve been trying to setup Alexa to control Plex on my new Toshiba Fire TV. I’m able to control Plex on two Apple TVs via Alexa (echo show). On the Fire TV, instead, I am able to connect to my Plex Server and play any movie, but Alexa (echo show) cannot find the Fire TV among the players.
Note: similar issue with casting from a browser: clicking on the casting icon on the top right corner of Plex in Safari or Chrome will show the two Plex apps on the Apple TVs but not the one on the Toshiba Fire TV.