"icon-image": "{marker-symbol}-15" doesn't work for dynamic js markers when adding it to a satellite map

[gertcuykens]

"icon-image": "{marker-symbol}-15" doesn't work on my own satellite raster map only streets-v8?

[jfirebaugh]

The satellite-v8 sprite has no icons. If you want to use icons, you'll need to create a custom style in Mapbox Studio and add them as desired.

[gertcuykens]

Hmm confusing, can you explain please?

I expect marker icons added by this layer code "icon-image": "{marker-symbol}-15" to display on any background map, street, satellite or custom?

For example

 map.addLayer({
        "id": "markers",
        "interactive": true,
        "type": "symbol",
        "source": "markers",
        "layout": {
            "icon-image": "{marker-symbol}-15"
        }
    });

They are dynamically added? I can't see how static icons using map designer will work?