I have a problem getting a iOS Development signing identity into Xcode. I have tried loads of things to get it working but I keep failing.
I have went the automatic way and let Xcode do it all but I kept going in circles where Xcode kept saying:
No signing identity found. Xcode can request a new iOS Development signing identity for you.
Followed by:
Your account already has a valid certificate. If you have your signing identity on another Mac, you can import a developer profile. You can also revoke the current certificate and request one again.

I have done many steps:
- Removing my account from within Xcode's preferences.
- removing everything from the key chain app.
- clearing everything from within the developer member center (apple developer website)
- removing all provisioning profiles
- removed my device
- revoked all all my certificates
- restarted Xcode to perform a 'Clean' project from the Product menu.
- even went into my project.pbxproj file to clear anything related to PROVISIONING_PROFILE
- removed all provisioning profiles from my device.
After this I went back into Xcode:
- added my account into the preferences section
- clicked View Details
- did a refresh
- Xcode automatically creates two certificates
- Xcode automatically creates provisioning profiles
- Xcode only creates a single Signing Identity: only for iOS Distribution.
This is my problem: I can not get an iOS Development signing identity.

After not getting it to work I went the old fashion manual way:
- first clearing everything like the above
- created new certificates manually, downloaded them and added them to the key chain app.

- created new provisioning profiles manually, downloaded them and dropped them onto the xcode app icon.
At the end the result is the same; When I am in Xcode > preferences > accounts > view details: - I do have a distribution signing identity
- I do NOT have a development signing identity
When I click the + button under the Signing Identities and choose 'iOS Development' nothing happens..
I have found lots of posts here on StackOverflow, I tried their suggestions but it won't work for me. Examples of other posts: here, here and here
I am working with the latest version of Xcode: 6.2. I am working on an app which is already in the App store.
Edited:
I have also changed the code signing build settings of my project and target into Don't code sign and put it back to iOS Distribution for ad-hoc and iOS Development for Debug.

