Thank you for posting your inquiry here in Microsoft Community, Ubique3.
I'm sorry to hear that there's an error when screen sharing your Surface to the Sony TV. I'll do my best to be able to assist you on this.
May I confirm if you're using the chrome casting when sharing the screen? Have you tried the chrome/edge casting with Windows 10 before?
Have you tried the methods below in your Surface Book 3? If yes, is it the same error?
- Launch the Chrome or Edge browser on your computer.
- Follow these steps depending on the browser:
- If using Chrome, click the More
icon → Cast...
- If using Edge, click the Settings and More
icon → More tools → Cast media to device.
- If using Chrome, click the More
- The cast
icon appears to the right of the address bar and a Cast Tab window will appear.
- Select the Sources dropdown and then follow the steps below according the casting method you want to use:
- Click Cast file → navigate to and select the file in the Open file window → click Open.
- Click to select the TV.
- To end casting, go to the right of the browser address bar, click the Cast
icon, hover over the device that is casting, then select Stop casting.
You may want to try to reach out Sony about this since based on the specifications of the TV it only supports Chrome Cast.
Hope this helps, otherwise, let us know so I can further assist.