Xcode 4 - "Valid signing identity not found" error on provisioning profiles on a new Macintosh install

Question

With Xcode 4.2 and later versions, including Xcode 4.6, there is a better way to migrate your entire developer profile to a new machine. On your existing machine, launch Xcode and do this:

1. Open the Organizer (Shift-Command-2).
2. Select the Devices tab.
3. Choose Developer Profile in the upper-left corner under LIBRARY, which may be under the heading library or under a heading called TEAMS.
4. Choose Export near the bottom left side of the window. Xcode asks you to choose a file name and password.

Edit for Xcode 4.4:

With Xcode 4.4, at step 3 choose Provisioning Profiles under LIBRARY. Then select your provisioning profiles either with the mouse or Command-A.

Also, Apple is making improvements in the way they manage this aspect of Xcode, and some users have reported that the Refresh button in the lower-right corner does the trick. So try clicking Refresh first, and if that doesn't help, do the export/import sequence.

Picture for Xcode 4.6 added by WP

Edit for Xcode 5.0 or newer:

1. Open Xcode -> Preferences ('Command' + ',')
2. Select the Apple ID from the list.
3. Click on the SETTING icon near the bottom-left corner of window, and choose EXPORT ACCOUNTS... Xcode asks you to choose a file name and password.

On your new machine, launch Xcode and import the profile you exported above. Works like a charm.

Picture for Xcode 5.0 added by Ankur

I just run into the similar issue today. Unfortunately my HD died on me so I couldn't do the migration mentioned here in the accepted answer. I had to do the following steps:

1. Connect to the Apple Developer member center then the iOS provisional portal.
2. Revoke my certificate.
3. Create a new certificate by providing a new pair of private and public key.
4. Remove all the previous provisioning profiles and create new ones.
5. Download the new provisioning profiles and install them in Xcode by just dragging them to the Xcode icon in the dock.

The same action is also mentioned on this post.

Make sure your certificate is in the "login" keychain. Highlight the login keychain if you don't see it, search for it. Then drag the cert over the words "login". Close and re-open Xcode, ta-da.

You need to copy over the private key and certificate from your old Mac. Open Keychain Access on the old Mac and look in the Keys category of the login keychain: the key should be there. You need to export both the public and private key, then copy yourkey.pem and yourkey.p12 to the new Mac.

Importing them using Keychain Access will probably fail, at least under 10.6; you can use these commands instead:

security import yourkey.p12
security import yourkey.pem

For the error

Valid signing identity not found

see Apple's published steps to resolve this problem.

Regarding the issue of your "5 existing provisioning profiles" on the iOS Portal which are missing from your local library in Xcode 4.x Organizer > Devices tab > Provisioning Profile section under Library.

I recommend following the steps that walks you through restoring missing profiles and also covers the case of an Xcode bug in which Xcode 4.1-4.2.1 mistakenly deletes from your local library profiles which are "Active" on the iOS Portal.

You will have to go to your developer site, go to your certificates, and generate a new one for your current MAC and add it to your keychain.

And then you will need to add the Provisioning Profile again. It should work now. Basically you need to perform the same steps you did when you first got your Dev Certificate.