Dark Souls 3 requires specific ports to be open. Even with UPnP enabled, many routers mishandle FromSoftware’s P2P traffic.
: If you are on Wi-Fi, try switching from a 5GHz band to 2.4GHz . While slower, 2.4GHz is often more stable over distances and less prone to the "hiccups" that kick you out of sessions. Ideally, use a physical Ethernet cable for the most reliable experience. Dark Souls 3 Online Fix
Ensure your PC's time and time zone are set automatically. Incorrect time sync can lead to "Failed to Log In" errors. Dark Souls 3 requires specific ports to be open
The official PC servers for Dark Souls 3 were restored in August 2022 Dark Souls 3 Online Fix