Conan Exiles Server - Steam Master Server Registration Issue

[xxlmash2022]

Conan Exiles Server - Steam Master Server Registration Issue
Problem
Conan Exiles Enhanced Dedicated Server (Docker: indifferentbroccoli/conan-exiles-enhanced-server-docker) won't register with Steam Master Server. Direct Connect works, but server doesn't appear in Server Browser.
Symptoms
LogGameSession: Warning: Autologin attempt failed, unable to register server!
LogOnline: STEAM: [AppId: 0] Game Server API initialized 0
AppId is 0 instead of 440900
Environment

Ubuntu Server 24.04 LTS
Network Mode: host
Access via WireGuard VPN tunnel

Already Solved ✅
steamclient.so Symlink Issue
Solution: Custom entrypoint with persistent symlink
bashdocker run -d --name conan --network host
-e PUID=1000 -e PGID=1000
-v /path/to/server-files:/home/steam/server-files
--entrypoint /bin/bash
indifferentbroccoli/conan-exiles-enhanced-server-docker
-c "mkdir -p /home/steam/.steam/sdk64 &&
ln -sf /home/steam/server-files/linux64/steamclient.so /home/steam/.steam/sdk64/steamclient.so &&
exec /home/steam/server/init.sh"
Result: [S_API] SteamAPI_Init(): Loaded '/home/steam/.steam/sdk64/steamclient.so' OK. ✅
Still Open: AppID Issue ❌
Unsuccessful Attempts:

steam_appid.txt in container → Ignored
Engine.ini edited with:

ini[OnlineSubsystemSteam]
SteamDevAppId=440900
GameAppId=440900
→ Ignored, AppId stays 0

DefaultEngine.ini doesn't exist

Network Status
All ports forwarded and functional:

7777/UDP, 7778/UDP (Game) ✅
27015/UDP (Query - responds to A2S_INFO) ✅
25575/TCP (RCON) ✅

Direct Connect works perfectly.
Question
How do you configure AppId 440900 for this Docker image to enable Steam Master Server registration?
Currently testing: Environment variable SteamAppId=440900

[codevski]

getting this issue as well not having the server show up on server browser

[2026.05.27-13.11.06:423][ 0]LogGameSession: Warning: Autologin attempt failed, unable to register server!