No I can't test if another TV can cast to my phone. The only message I get is S10 or S8 disconnected, depending on who tries to use it, me or my wife.
The thing is that it occasionally works showing that it is able to do it, only to get disappointed later and really most of the times by not being able to connect again.
Mirroring phone to the TV works ok though. I also contacted Samsung repair and reseted the TV as I was instructed but the problem persists.