I bought a 55inch tcl Roku smart tv and I want to screen mirror off of my iPhone to the tv and when I try the tv says that there are no devices listed. I’m home bound and would like to watch my church service which is on Facebook live and I cannot get it on the tv. What or how can I do that???
The roku doesn't support airplay. You can probably do it with this (paid) app https://www.airbeam.tv/.
Or maybe you can encourage your church to put their service on youtube.