Until tonight.
The confusion comes from timing. Forza Horizon 3 was not a broken game. It was a sunset game. When Microsoft delisted it due to car and music licensing expiring, they also stopped actively supporting its finicky Windows 10-era networking. The legitimate "fixes" that worked in 2018—like reinstalling the Xbox Identity Provider or disabling IPv6—are now often futile because the servers are on life support. forza horizon 3 online fix
The problem wasn't just that the official matchmaking servers were gone. It was that Horizon 3 used a hybrid peer-to-peer system that relied on a Teredo IPv6 tunnel and a specific set of Xbox Live presence servers. Without those, the game would boot, you could drive solo, but the "Horizon Life" tab remained perpetually grayed out. Until tonight
Your ISP’s DNS may route you to a dead Xbox relay server. It was a sunset game
A genuine troubleshooting guide for getting the official online features (convoy, co-op, auctions, liveries) working on a legitimate, purchased copy of the game. These fixes involve checking Windows services, resetting the Microsoft Store cache, updating the Xbox app, and ensuring the Xbox Networking service shows "NAT Type: Open" and "Server connectivity: Connected."
You can still host and join private sessions with friends directly on PC without an Xbox host. 2. Teredo Adapter Configuration