【Account Functional Lock】Unexpected Disconnect via Launcher ONLY - Exhausted All Support

1. Summary of the Issue
My account (Cobain#3544) experiences a 100% reproducible "An unexpected disconnect occurred" error precisely when loading into the game world only when launching through the official Steam/GGG client. Launching the game directly via the PathOfExile2_x64.exe file with the exact same computer, network, and game installation results in perfectly stable gameplay and login.

This conclusively proves that the issue is a server-side account state or authentication problem, not a local technical fault.

2. Key Evidence & Diagnosis
This diagnosis is based on a controlled test that isolates the variable:

Constant/Identical Conditions: Hardware, OS, Drivers, Network Connection, Game Installation Files.

Single Variable: The game launch method.

Result:

Official Launcher (Steam/GGG): FAILS with "unexpected disconnect" at world load.

Direct .exe Launch: SUCCEEDS completely, allowing for hours of stable play.

The only technical conclusion is that my account triggers a failure point in the official login/auth pathway that does not exist in the direct connection pathway.

3. Completed Troubleshooting & History
I have exhaustively performed all standard and advanced troubleshooting, rendering further generic advice无效.

Three Full Reinstallations: I have completely uninstalled (including manual deletion of AppData local/roaming folders) and performed clean reinstalls of the game three times.

Network Reset: I have reset my network stack (winsock, TCP/IP, DNS) and power-cycled all routers/modems.

Support History: This issue began on October 26, 2024. After extensive communication, the final instruction from Forum Moderator Lisa was: "If you believe this is a bug, please post in the relevant bug report subforum... This establishes a direct line of communication with development team members."

4. Impact & Final Plea
The direct .exe workaround is not a valid solution. It completely breaks all overlay-based applications, specifically trade price checkers, which are fundamental to the modern Path of Exile trading experience. I am therefore locked out of the complete game service I paid for.

I have done everything possible on my end. This post is my final attempt, as directed by support, to get my account reviewed by a developer who can check server-side logs and correct the erroneous flag/state on Cobain#3544.

Thank you for your time and investigation.