HTML Mute Tag Not Working!

In the html file:

<video preload="metadata" muted="true" controls playsinline webkit-playsinline loop>

The video does not pick up the muted tag and plays with sound instead in both the browser and on the device.

If I reference the video and set the volume through the .ts

el.volume = 0;

The mute works on the browser but still does not work on the device.

Does anyone have any idea what is going on? Any help is greatly appreciated. Thanks!