Unfortunately, this is a side-effect of an addition Google made to the Chrome web browser recently. You now need to alter a setting on your TVs (or the device powering them).

Video Tutorial:

Amending your site settings

Open a OneUp TV slideshow on your display
To the left of the URL, click the little icon (usually a lock symbol)
Click "Site Settings" from the options that appear
Scroll down to "Sound" and change the option to "Allow"
Sounds will now play uninhibited when a trigger goes off!

Why did they make the change?

Google acknowledged that many users around the world felt frustrated when they opened a website only for videos and sounds to begin blaring out without their consent. It provided an unpleasant experience and so Google decided to put a stop to it by preventing websites from auto-playing videos and sounds.
Unfortunately, this also includes OneUp - we cannot play your celebration music without your explicit consent. Strange, we know!

Sound still not playing?
Check that your TV isn't muted/turned down (try opening a YouTube video to check)
Check that the device powering your TV isn't muted/turned down

Whilst we're generally unable to provide assistance with hardware, if you're still stuck you can get in touch and we'll try our best to help!
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