Disconnections, Matchmaking Issues, Online/Server Issues

Troubleshooting Hub Legacy Troubleshooting FH4 Troubleshooting
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The following sites can help identify large-scale service outages in any particular region.

https://support.xbox.com/en-US/xbox-live-status

https://azure.microsoft.com/en-us/status/history/

https://downdetector.com/status/xbox-live/map/