Question: An app extension is causing a code signing issue. This app is already on the Appstore (with this extension) yet overnight for some reason when I have come back to this app im getting![enter image description here](https://i.stack.imgur.com/jsrhn.png)

A strange error as its contradicting itself by showing two exact identical certificates in said error message.

Ive tried 
clean and restart, deleting derived data, regenerating provisioning profiles, deleting and creating new profiles. using both xcode 6.1 and xcode beta and [This](http://aplus.rs/2014/embedded-binary-is-not-signed-with-the-same-certificate-as-the-parent-app/)

I have also searched SO [Xcode6:Embedded binary is not signed with the same certificate as the parent app](https://stackoverflow.com/questions/25927604/xcode6embedded-binary-is-not-signed-with-the-same-certificate-as-the-parent-app) and no solutions offered worked

(Deleting the app extension removes the error)

Answer: 
I have tried the following solution is working this morning! Please try it!

> 
> The only solution here was that I went to Developer Portal, removed
>  all profiles, then removed all downloaded profiles through Finder, did
>  Clean project and Clean Build folder, closed and re-opened Xcode. 
> 
> 
> Then I opened my project, went to both app and extension targets - at which
>  point Xcode realized no profiles are present and thus goes to
>  Developer Portal to get them. Since there’s nothing to download, it
>  goes through each App ID you have on your account and creates
>  development profile for each one.
> 
> 
> 

<http://aplus.rs/2014/embedded-binary-is-not-signed-with-the-same-certificate-as-the-parent-app/>
When I had this issue I went to the Apple Member Center and realized that the Provisioning Profile (for the extension) that I had created was marked as 'Invalid'. I just re-created the Provisioning Profile with the same certificate that the app is signed with and then downloaded it via Xcode > Preferences > Account > refresh. 

Once I had the new provisioning profiles I selected them in the build settings. I selected the provisioning profile that was just created and also selected the corresponding certificate in the Code signing entity in the build settings and that fixed the issue. 

Note that the extension has its own app id and hence its own provisioning profile.