Windows 10: My Sony TV is unable to be set as the default in SOUND DEVICES on my W10 Dell Laptop

Via SETTINGS>SYSTEMS>DISPLAY and SOUND, I select SOUND CONTROL; PANEL to see under PLAYBACK a list of my connected devices.My issue? I'm unable to set my TV as the default playback device.I've connected my Dell XPS L701X i5 M460 2.53GHz 8GB RAM 250GB SSD GT 435M GPU Windows 10 to my Sony KD-50X72K TV via HDMI, but I find I have no sound when listening if only to BBC iPlayer radio.IF I'm able to get/find the TV in the list of playback devices, it's without a green TICK, but a red down pointing arrow. IF I

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no Sound on TV device mgr TV shows as media device not under sound


I can cast music to my Sony Bravia XBR 65x850b tv.
However when I have it as a a duplicate display sound I get on the speakers primary display does not come from the speakers on the TV.

On the device manager the TV shows as a media device.
However, the TV does not appear under sound.
Alll that shows under sound is
Speakers
Digital audio (S/PDIF). Digital audio is set as default

How can I have any sound on my PC desktop also come through my TV?

Do I disconnect my Speakers and have the sound come through my Samsung monitor?

What additional info might the list need to help solve this?

 

Screen mirroring With Dell Laptop and Sony TV..

I Have Dell Laptop (Latitude model) with Windows 10 as OS. Recently i have purchased Sony KDL 48W700C LED TV model. Plz tell me how to screen mirror my Dell laptop with Sony TV?

 

Audio not working on Sony TV Monitor that I have connected to my laptop

I have a Sony 32" Monitor connected to my HP Laptop via a HDMI Cable

Display works perfectly , sound on all apps are coming out of laptop speakers with the exception of Outlook 21 where the new message alert does not occur

If I change my default sound output to the Sony TV Screen no sound works at all

The Outlook setting box for play sound on new email is checked

Any suggestions?