Infinite loading screen at title and "Party Not Ready" error

Platform: PC (EA App)

Issue: Infinite loading wheel at start screen & "Party Not Ready" matchmaking loop.

Description of the problem:

Since the recent update/migration to EA AntiCheat, Apex Legends fails to initialize properly.

1. Initial symptom: In-game, attempting to search for a match results in an instant cancelation with a "Party Not Ready" error.

2. Current symptom: After attempting to repair/reinstall the EA AntiCheat service, the game now gets stuck indefinitely on the main splash screen (MARKED / Loading spinner). It does not display the prompt to "Click to Continue" or allow access to the Data Center / Server selection menu (Tab).

Steps already attempted without success:

• Reinstalled/Repaired EA AntiCheat using the installer in _Installer\customcomponent\Javelin.

• Verified and started EAAntiCheatService manually from Windows Services (services.msc).

• Cleared EA App cache (%localappdata%\Electronic Arts\EA Desktop) and deleted local profile data (Saved Games\Respawn\Apex).

• Launched both EA App and Apex Legends as Administrator.

• Fully reinstalled EA App and Apex Legends.

Note: My EA Account is linked to Steam, and Apex Legends was previously installed via Steam on the same drive. A registry key mismatch or token collision between Steam's launch protocol and EA App's EAAntiCheat service might be causing the handshake to fail.