Originally Posted by
sehgalanuj
Were you able to get the VN PNR by asking AF? In some cases, I have been unable to use the PNR to select seats online, but was able to select them by calling in to VN's call center. This was for a AF coded flight, FB redeemed like you did, but at least 5 years ago now.
obtaining the VN ref is easy, but even with this, you won't be able to pre-select seats if you are booked under the code-share. Even with calling or visiting a VN office in person.