I have also been having this same problem with my main Fed toon. He achieved rank 3 diplomacy several months ago, but still has yet to receive the Transwarp to Starbase 39-Sierra power or the Diplomatic Immunity power. I've submitted several bugs reports and I've also tried updating the rank status with Lt. Ferra several times to no avail. Heretic, should I also send you my @handle?
this picture may be of some use to you Heretic,i've been reading it wrong.
it says i can enter because someone has given me the power,but look at my buffs,i don't have it.
i wonder if someone gave me the power before i reached tier four and when i hit tier four it was out of whack because the game thought i had it already .