I have just upgraded from XCode 5.1 to XCode 6.0 GM and can no longer sign my applications for ad-hoc deployment. I perform the following steps:
Previously this worked (I signed an application last night, and upgraded this morning), so any ideas would be gratefully received.
You are not allowed to perform this operation. Please check with one of your Team Admins, or, if you need further assistance, please contact Apple Developer Program Support.
Here is the info from my XCode account page.
You need to reimport your provision profile and signing identity. It should be a .developerprofile file. It should be under accounts under XCode preferences. You can see all your developer/member info. I'm assuming you're an agent?