Make app icon on task bar have a transparent background (UWA)
You need to use the "altform-unplated" qualifier in your icon's filename. For example:
SmallLogo.targetsize-32_altform-unplated.pngIf you really want to be thorough... For Square44x44Logo in your manifest, you should have 6 versions of the icon (normal, high contrast black, and high contrast white, x3 for unplated versions) for each of the following target sizes: 16, 20, 24, 30, 32, 36, 40, 48, 60, 64, 80, 96, and 256.
For example, here's 256:
SmallLogo.targetsize-256.pngSmallLogo.targetsize-256_contrast-black.pngSmallLogo.targetsize-256_contrast-white.pngSmallLogo.targetsize-256_altform-unplated.pngSmallLogo.targetsize-256_altform-unplated_contrast-black.pngSmallLogo.targetsize-256_altform-unplated_contrast-white.pngThat's a lot of PNGs.