App submission failed - 1+ corrupted binaries/non-public API usage and no additional details

Question

I’ve been submitting my app to the App Store for test flight and after build 11, I’ve been getting failures via email from Apple:

Non-public API usage: The app conta

Answer 1

Our projects that didn't have bitcode enabled started failing on Friday 2018-01-26. Setting Enable Bitcode to Yes in the Build Settings of those projects solved the issue.