Please check the following.
Check whether the configured user id in your fb settings page is wrong or not.
The user id is the id of your personal fb account where the pages are linked.
To find the user id, please login to your fb personal account from a browser and follow the link http://kb.xyzscripts.com/how-can-i-find-my-facebook-user-id/
Now after authorization, you can see all your pages.
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