I am lvl 50, have 15k seals, Grand Company Adders, same problem. She claims that i have not satisfied the requirements. I found this too:
http://ffxiv.gamerescape.com/wiki/Cu...the_Common_Pox
http://ffxiv.gamerescape.com/wiki/Grand_Company_Ranks
If I had to hazard a guess, they took this out but not the requirement?