I have a Sony Bravia XBR-65-900C and I've been trying to cast YouTube and Prime Video from my phone. I get this notification when I try.
"Untrusted device XBR-65X900C couldn't be verified. This could be caused by outdated device firmware."
My current software version is PKG6.827.0261NAB. This is the current version according to Sony. Google isn't giving me anything useful and I'm curious if anyone else is having this issue.
My LG and firestick recently started replying that they were "Available for specific Video sites" when I would try to cast. Must have been a software update that's blocking some sites. Tivo 4K still allows all casting.