PUBG Mobile Login Failed Error (9999,2001)

I am experiencing a login failure issue in PUBG Mobile, and I keep getting the error message: "Login failed, please try again. (9999,2001)". No matter how many times I try, I cannot access my account.

I have spent a lot of time and effort on this account, and it was perfectly fine before. Then, out of nowhere, I got locked out. I have no idea what caused this issue, and I am desperate for a solution.

PUBG Mobile support, please fix this immediately! I need my account back as soon as possible. If anyone else has faced this issue and found a solution, please let me know.