It's simple
When you launch the app for the first time, if you decline the option to scan the network, there will be no Chromecast icon during playback
Solution: uninstall and reinstall the app, accepting the option to search for Apple Reims on the network at the first startup, and the problem is resolved
JJ
I have the same problem. I can cast Netflix and YouTube but not Disney. Where do I need to go in the settings? Thank you.