I can confirm that this is happening for my users as well. I've had to tell them to redeem the code through the App Store app as a workaround instead of through my app, which has led to a lot of confusion. Should we just remove the .redeemCode StoreButtonKind for now until it's fixed?

https://developer.apple.com/documentation/devicecheck/dcappattestservice/3573915-issupported If you read isSupported from an app running on a Mac device, the value is always false. This includes Mac Catalyst apps, and iOS or iPadOS apps running on Apple silicon. So it appears it's just not supported on any Mac devices yet, despite the DCAppAttestService class being available in macOS Big Sur. I agree with you, the documentation needs to be updated to explicitly note that Mac devices have yet to support the actual service.