Xcode 12 Beta on MacOS 10.15 (Catalina) Can't Enable Storekit Test Configuartion

Can't enable the StoreKit test configuration file for a MacOS App. There is simply no dropdown from which to select it from in the Scheme Run Editor dialog?

Am Running Xcode 12.0 Beta 5 on Catalina. This particular project is several years old and the MacOS App has been in the store for quite a while? To date I have been working in the latest version of Xcode 11. I followed the video and documentation steps to:

• Add a configuration file to the Project.

• Set test meta-data for several IAP non-consumables.

But, when I try to enable the Configuration from Scheme Editor -> Run / Options there is NO Storekit Configuartion dropdown from which to select it. It is simply not there at all on the dialog?!

Does the project have to be "converted" somehow to work with Xcode 12.