Now heres a question, does it matter if we have a hacked iphone or a non hacked iphone? Im assuming they would want to know how it performs on both versions of the software as the only diffrence between the two versions (even though they are the same) is you can run more personalized software on the hacked version.
I can't answer if DirecTV will accept you or want you to test with a hacked version, but from a purely technical standpoint as long as you are still able to install and run software from the App Store, you should be able to install the beta app. Now, whether it works properly or not is a different story as jailbroken phones aren't exactly the same as non-jailbroken phones.