CloudKit Permissions Failure

I'm getting the following message on running my App:

> "Permission Failure" (10/2007); server
> message = "com.company.ipadApp is not a valid Bundle ID for
> container iCloud.com.company.app"; uuid =
> xx; container ID =
> "iCloud.com.company.app">

I created an iPhone app and then made another target for an iPad app, and for it to use the same CloudKit container - I've checked the app ID on the developer panel and assigned the container to the new iPad app ID, but for some reason it's still telling me I've a 'Permission Failure'!

How do I get my iPad app to use the same container as the iPhone App?