Change Facebook developer account for an iOS app - bundle identifier

Question

I've developed an iOS app that is integrated with Facebook to allow users to log in using their FB accounts. That works fine.

The app is also supposed to use a web service developed by another company. Said web service also uses Facebook integration.

Both my app and the web service were developed using different Facebook developer accounts. Now it seems a major problem I've got needs both of these to be part of the same "Facebook application" which means they'd have to belong to the same Facebook developer account.

I asked the other company's developer to add a native iOS aspect to his Facebook app, gave him my app's bundle ID and received a Facebook app ID and secret in return. I made the appropriate changes to my app's Info tab in XCode - the bundle ID is the same one that I gave him, the FacebookAppID is the one I got from him and so is the URL Schemes thing (with an "fb" preceding the actual FBAppID).

However, when I try to log in using Facebook credentials in the app, I constantly get com.facebook.sdk error 2 which is explained in the console by this message: FBSDKLog: System authorization failed:'The Facebook server could not fulfill this access request: remote_app_id does not match stored id '. This may be caused by a mismatch between the bundle identifier and your app configuration on the server at developers.facebook.com/apps.

Is there a step I'm missing in this transition of app between FB developer accounts? Could something else be the cause of the problem here? If my question is off-topic, please at least point me in the direction where I could get some answers.

Answer 1

Indeed - it turned out that the problem was exactly what the error message said: the bundle ID was different for both the application in XCode and in the Facebook developer account; that was because the developer from the other company made a spelling mistake (lower case instead of upper case letter) in the bundle ID.