Hey there! If you're not able to remove the Security Key per this guide, you'll have to contact support and ask them to remove it for you.
Thanks for the answer. But i dont have the original serial for my account, i cant ask for a security key by smartphone app. ☹️
To remove your Security Key from your account:
Go to www.swtor.com and click on Log in.
Enter your display name and your password, leave the Security Key code box blank, and click on Log in.
We’ll ask for your Security Key Code. Under the Security Key code box, click on Lost your Security Key?
The part of "lost your security key?" didnt show for me
