Audio only though headphones on Microsoft Surface

Plex Players
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1

i have been trying play my movies on my Microsoft Surface and the audio will only work through the headphone jack. i get audio for other apps e.g. zoom through the internal speakers.
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2

I just tried on my Surface. I can play through the internal speakers, headphones and via BT using Plex Media Player or with the web player. Plex HTPC hangs on start up for some reason.