How to create ipa in xcode using your developer account and provision profile made from another account?

Question

Apple Xcode

Hey!
Our customer wants us to send him a build (by testflight) using his provision profile.
We received from him the provision itself, certificates, keys, all this was added to ixcode. Changed the bundle identifier to the one in the profile.
We created an archive, we are trying to export it as an ad-hoc deployment. And we get this message:

What can it be? What are we doing wrong?
xcode 6 beta, ios 8 sdk
thanks :)