I\'ve listed here Yahoo Integration steps which I\'ve followed.
From the Yahoo docs you linked here are a few things to check:
Check that you are requesting and receiving approval for the correct permissions from the user
Inspect the YOSResponseData
object, if an error occurred it should contain an NSError
object.
It also contains an NSHTTPURLResponse
object. Check the response header and status code.
You've probably checked this stuff already, if so add the results to the question.