IAP failing in Unity 2020.1.0a3 Mac standalone

I am building a Mac standalone build using Unity 2020.1.0a3, creating an xcode project, using the codeless IAP.
Everything works correctly in the editor, but when I make a build, or submit to the Mac App Store, I am getting this error

Fallback handler could not load library /Users/**************/Library/Developer/Xcode/DerivedData/*************-*************/Build/Products/Debug/
***********/Contents/Frameworks/MonoEmbedRuntime/osx/libunitypurchasing

----

DllNotFoundException: unitypurchasing

at (wrapper managed-to-native)

also, it does not seem to be intializing properly:
Purchase failed because Purchasing was not initialized correctly

(Filename: ./Runtime/Export/Debug/Debug.bindings.h Line: 35)

it seems from this article dllnotfoundexception-in-standalone that the dll file? needs to relocated somehow. Not sure how to do this.
I would sure appreciate any suggestion on how to fix this. It seems to me that IAP cannot and has never been able to function on Mac Standalone builds ( it never has for me, anyway ), but would love to hear from anyone who has successfully implemented it.