It looks like you're new here. If you want to get involved, click one of these buttons!
According to another post under "Android-and-apple-devices" the issue of syncing credits across devices has been under review for over a year. The fact that purchased or accrued credits cannot be used on my phone if I have them on my desktop or vice-versa is ridiculous. Both devices use Facebook for management, and everything else syncs just fine. This should be a simple issue to resolve and every other game I've used works properly.
Please fix this as soon as possible as it looks like a cash grab by Zynga in forcing users to purchase credits for every device they use.