I lost linked EA account

I have a complicated issue regarding account linking.

The account belongs to my older brother. He plays on an iPhone, and the account is linked to his Apple account. Previously, I was able to log in on my Pixel phone without any problems by signing in with the EA account and receiving the verification code from him.

He can still log into the game normally on his device, and all the data is still there.

However, after I switched from his account to my secondary account (OVR 112), which I log into using Google Play Games, the problem started. Since then, his account no longer appears to be linked to the EA account on my device.

When I try logging in using an emulator or my phone, even after uninstalling and reinstalling the game, I cannot access the OVR 120 account anymore. On my device, the account data appears to be completely reset, but on my brother’s device, everything is still intact.

I believe the link between the EA account and the game account has somehow been disconnected on my side.