I think I just experienced the same thing, but managed to get it right.
Create the Revora account. (You wont be able to login to online play with this alone).
You then go to the t3aonline.net site. Login there using the Revora account details. Then it takes you to a page where you create your t3a password and username.
Then in game, you do the Revora account name at the top. Then the password is the t3a password you just created (not necessarily the same as the Revora account password).
Then the Nickname I think can be anything (i may be wrong, still to test), but I just put in the name for the Server Loging on t3a...
Then voila I was in haha.
Instuctions are not clear that this has to be done.
I first tried this in 2015 and failed ! I just gave up.... Im sure this has happened to a lot more people who have also just given up and never come back... Instructions should be made clear or the process simplified in order to build the online community back up !
Edited by Ryu007, 01 September 2017 - 04:11 PM.