: Open your web browser and go to the official Xbox privacy & online safety page.

Sign in using the exact Microsoft account credentials you use to play the game.

A blank black box will appear. It will disappear on its own, and the Store will open. Restart your PC and try the link again. Step 4: The Registry Fix (Advanced)

udp_socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); int opt = 1; setsockopt(udp_socket, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); // Enable keep-alive (every 5 sec) int keepalive = 1; setsockopt(udp_socket, SOL_SOCKET, SO_KEEPALIVE, &keepalive, sizeof(keepalive)); // Bind to ephemeral port range local_addr.sin_port = htons(0); // OS chooses bind(udp_socket, ...);

// Step 3: Wait for peer's relay address return ws_recv_relay_addr(p->relay_target);

This issue isn't just a minor inconvenience; it's a complete barrier to online play. When a game relies on Xbox Live for matchmaking, party chat, or session validation, the connection cannot start if this protocol fails. The game may load fully, but the moment you select online play or accept an invite, the process is interrupted. This error affects both Microsoft Store games and many Steam or third-party titles that integrate Xbox multiplayer APIs, meaning that where you bought the game doesn't matter once Xbox services are involved .

The updated implementation introduces three new components:

Scroll down and click the button. Wait for it to finish.

If a simple update doesn't stitch the protocol back together, you can force Windows to re-register the app links. Press the to open your system Settings.

Strangely, if you are clicking these links from a web browser (like a Discord invite or a web-based game tracker), the browser might be blocking the "External Protocol Request."

source/net/msxbl_link.c (line 187–210)