To be clear, there is definitely an intermittent issue with showing a Game Services button on preview. This is fixed and will be in the next release. It is at least partially separate from what might be happening on a device. We are still troubleshooting the behavior on a device, but it's not clear yet if there is a separate issue on devices or not. There are some instances where a Game Services button might not show on the device that are valid (misconfiguration or other errors).