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I had issues with Carthage and the new xcode12. It looks like that Carthage currently no more is usable with Xcode12 and iOS simulator. When you build the frameworks with 'carthage update' or 'carthage build' there comes an error. A deeper look says "have the same architectures (arm64) and can't be in the same fat output file" So the iOS Simulator build is missing in the framework. This already is discussed as issue here Carthage/Carthage#3019 and here ashleymills/Reachability.swift#370
My workarround was just to move from carthage to Swift Packages. I found out that is really easy to provide an existing iOS framework as Swift Package. Just create a fork of it, put there a configured Package.swift file into the root folder, double click it in finder to open it in Xcode as a SWIFT PACKAGE PROJECT !!! - now just add/change the path to the source files in the Package.swift file. When you could build the project, all is fine and push it to your repo - thats it. For this works.
Maybe you want to add Swift Package support ?