Apple's TestFlight and Certificates

Question

I recently did some work for a team project and I am trying to use Apple's TestFlight to Submit a new build for an existing app on iTunes Connect for testing, but I got stuck with certificates and provisioning profiles.

What I have Done so Far

• Although I was an enrolled iOS developer already (I have my own apps on the AppStore), I gave to the Team Agent a different e-mail address as Apple requested. With this e-mail address I was invited by the Team Agent to iTunes Connect and also to the Member Center and I enrolled again as an iOS developer.
• Afterwards, since I wanted to use Apple's TestFlight, instead of requesting a Developer Certificate through Member Center, I walked to the Team Agent, provided him with my CSR and asked him to prepare a Distribution Certificate for me, which he then sent me.
• After installing this Distribution Certificate on my XCode, I still couldn't Validate the app because I did not have enough privileges. Downloading and installing existing provisioning profiles from the Member Center did not help either.

My Questions

1. What should I do in order to have enough privileges to Validate and Submit the build on iTunes (and proceed with using Apple's TestFlight)?
2. Do I need both a Developer's Certificate and a Distribution Certificate in order to be able to upload a build for testing on iTunes Connect? Isn't the Distribution Certificate enough?

Any help will be deeply appreciated,

Thanks!

Answer 1

1. What should I do in order to have enough privileges to Validate and Submit the build on iTunes (and proceed with using Apple's TestFlight)?

   To upload binary you need to login with acount that has role Technical or Admin. More about Role & Responsibilities on Apple Documentation page

2. Do I need both a Developer's Certificate and a Distribution Certificate in order to be able to upload a build for testing on iTunes Connect? Isn't the Distribution Certificate enough?

   In order to upload binary to iTunes Connect (no matter for releases or Beta testing trought TestFlight) you need to sign binary with Distribution Certificate & Provision Profile