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We don’t provide the official feature to revoke the API calls in the failed CloudScript functions. As the workaround, you can call the Server APIs manually to revoke the corresponding updates. For example, you can use the Server API RevokeInventoryItem or RevokeInventoryItems to revoke the inventory items you granted. To revoke the user data updates, you need to call the UpdateUserData, UpdateUserInternalData, UpdateUserReadOnlyData, etc. to update the data to the previous version manually. We would suggest you verify the corresponding data updates before granting users items.

If you meet the more complex situation, for instance, the CloudScript function is blocked since the time out or other Internal Server Errors, the error would be difficult to be identified. For such API errors, you can add the try-catch to function so that you can handle the errors using your own code. Please check this documentation -- Handling Errors in CloudScript - PlayFab | Microsoft Docs for more information. As for the problems caused by CloudScript function's own logic, they cannot be caught by try-catch, it is recommended to solve these problems in the development stage.