It is common for some problems to be reported throughout the day. You see the Screen Mirroring standby screen.
Restart your phone and TV, then try connecting again. Projecting Crunchyroll via a browser is a much better experience than using the app on my PS4.
Select your Apple TV or AirPlay 2-compatible smart TV from the list.
Crunchyroll screen mirroring not working I’m having the same problem.