Can't login to KOTZ SEA using Facebook

1. Your Server: S13 Pisces (SEA)

2. Your Character ID (the number) and character name: 10220003694464683 / peacerlin7

3. Basic description of the problem

I can't login to my account using Facebook, the official FB page also said that there is a problem logging in using FB, so I tried to bind my account to GTArcade. When I re-login the game using GTArcade, it directs me to a new account, not my old one. How can I login to my old account??

4. What time the problem occurred: 25 Jan 2023

5. Your device (e.g. Android or iOS): Android 10