Swift tools support doesn't build with xcodebuild

I am struggling to get my CLI tool (which uses swift tool support core (tsc)) to build with xcodebuild. Does anyone know what I can try? It fails with:

** BUILD FAILED **

The following build commands failed:
    CompileSwift normal arm64
    CompileSwiftSources normal x86_64 com.apple.xcode.tools.swift.compiler
    CompileSwift normal x86_64

I want to try xcodebuild instead of Xcode because I don't think CLI tool can be notarized through Xcode, so I am hoping xcodebuild can help notarize the CLI tool.

I also wrote the question up in Stack Overflow here with pictures :rainbow:: https://stackoverflow.com/questions/66823007/swift-tools-support-doesnt-build-with-xcodebuild

Thank you

I've attached a file containing the full logs: Dropbox - build.txt - Simplify your life