I was incorrect above.. manage_pages and publish_pages *are* the correct permissions. There were different permissions with v7.x that were incorrect.
That message is because you haven't gone through the app review process. However, in many cases, the review process isn't actually required. It all depends on who you are setting up the channels for. If the Channel is for the Facebook user that also created your Facebook app, and you don't need to setup channels for other users, then you can skip the review process. To get the permission right away:
* In your Facebook Application settings, switch the app to "Development" mode by toggling the "Live" switch
* When in Development mode, your application can request permissions from anyone who is setup as an admin or developer of the Facebook Application
* Once the permission is granted, you can switch the app back to Live and the permission will still be valid.
The above works great if there's just one (or a handful of) users you know that needs to have the Channel setup. You just need to make sure they are setup as a Developer or Admin in the Facebook Application -> Roles setup area.
I hope that helps, but if you need anything else, just let us know!
Thanks,
Alex