I have no idea, except that it blocks video output, and comes up with a prompt to log in to whatever service via the TV. I can cast just fine from e.g. a webpag

I have no idea, except that it blocks video output, and comes up with a prompt to log in to whatever service via the TV. I can cast just fine from e.g. a webpage or a podcast app. But Netflix or Max or Prime? Forget it.