First is wrong documentation. When running the command skip icon --open-preview --background #C7E9C0-#60B27A symbol.svg, it prints "Error: Missing value for '--background '" but in the help printed below the error, the format is exactly the same:
# Create new icons with a background gradient
skip icon --open-preview --background #3E8E41-#2F4F4F
No problem, I ran the command like this: skip icon --open-preview --background="#C7E9C0-#60B27A" symbol.svg and it worked. But when I rebuilt the app for Android and iOS, neither platform showed the app icon. Looking at Xcode, it's clear why it doesn't on iOS. However, I'm not sure what's wrong on Android.

First is wrong documentation. When running the command
skip icon --open-preview --background #C7E9C0-#60B27A symbol.svg, it prints "Error: Missing value for '--background '" but in the help printed below the error, the format is exactly the same:No problem, I ran the command like this:
skip icon --open-preview --background="#C7E9C0-#60B27A" symbol.svgand it worked. But when I rebuilt the app for Android and iOS, neither platform showed the app icon. Looking at Xcode, it's clear why it doesn't on iOS. However, I'm not sure what's wrong on Android.