Has anyone been successful at getting alternate app icons to work in Xcode 26.2 with Icon Composer icons? I've tried every suggestion I've found online (there's not many), various Info.plist configs and build settings, nothing works.

Logs show "The operation couldn’t be completed. Resource temporarily unavailable" each time I try to set the alternate icon.

UIApplication.shared.supportsAlternateIcons returns true

For those that have this working, what are your build/info.plist settings you're using? Are you also using the old icon asset catalogs?

I've also tried using the exact same config Apple includes in the sample app - still nothing.