FC Mobile Login Error 0x00000001 on Realme 12+

I have been unable to play FC Mobile on my Realme 12+ since I bought the phone. Every time I open the game, it shows "Login Failed - We've failed to log-in. Please try again. Error: 0x00000001" before the EA login screen appears.

My FC Mobile account works perfectly on another device, so the issue is only on my Realme 12+.

I have already tried:

Reinstalling the game

Clearing app data and cache

Restarting the phone

Using both Wi-Fi and mobile data

Updating the game and phone software

The issue still persists. Please help me identify the cause and provide a solution.

Thank you.