Login with username and password only and leave the code bit blank, you should see the url as shown in this link to remove the key.
Depending on how old the other key app was ensure you have the new one on the phone as also mentioned in that link.
You are best phoning them (Link) and manually getting the key removed , the security key app needs a code from the website to generate the correct codes, and this is then based on the correct time on the device in accordance with time.gov
The login should proceed to prompt for the security key if the username and password is correct , if they are not correct it will say login failed.
Hey Owen
Been trying to login into SWTOR, something must have reset my security key app, now it says it needs the Activation Code.
I have went to swtor.com and requested a new number, that did not work, I tried changing my password, then it said it needed the code again
I have uninstalled the app and reinstalled, same problem
I have tried ringing customer support, but no matter what time of day it says they are not there, even with proper time conversion
if you dont have a functioning key and the password is wrong , calling is the only way they need to remove the key manually
double check numbers etc in https://answers.ea.com/t5/General-Discussion-Technical/INFO-Getting-Help-and-Board-Guidlines/td-p/4806237/jump-to/first-unread-message
I would say for you early morning is best say up until 11 am NSW time at the latest maybe best to try around 9 am
