Sandbox User Change in Mac App Store Login

Question

I'm testing my app for the Mac App Store.

I've used a Sandbox user and purchased all my in-app purchases.

I want to test with a new Sandbox user, to do all the buys again, but I'm stuck.

On the resulting Mac App Store login window, how can I change the Sandbox user's Apple ID? It's grayed out and I can't edit it.

Answer 1

I had to delete the folder:

~/Library⁩/⁨Caches/com.apple.appstore⁩

and then reboot.

The Apple ID was then editable in the Mac App Store login.

Answer 2

This clears the sandbox account for the App Store (but not for iCloud or GameCenter), on macOS:

Open App Store app > Preferences (⌘ ,) > Sandbox account > Sign out