For some reason ASSETCATALOG_COMPILER_APPICON_NAME wasn't defined. I set it to my image and was able to resolve the black/blank icon.

@DTS Engineer No problem! Really appreciate your help. Here's the case ID I received in the email. 18153852

@DTS Engineer Tysm! I included the black whistle as just a test build. I intend to use the green icon with the S. Not sure where the solid black icon is from though. Do I need to delete any of the old builds? Request ID: 102810549329

@DTS Engineer Thank you so much for taking a look. App name: SpeedyStride Apple ID: 6747301921