This error usually appears when game servers are overloaded or your network settings block the connection. Check your firewall — add the game executable to exceptions. Router settings matter too: enable UPnP or manually forward ports 80, 443, and 3074. If you're on Wi-Fi, switch to Ethernet cable. Sometimes antivirus software interferes with online games, so temporarily disable it and test the connection.
This happens when the game can't sync with other players. Restart Ubisoft Connect completely — close it from system tray, not just the window. Clear the game cache: navigate to Documents/My Games/Tom Clancy's The Division 2 and delete the cache folder. Verify game files through Ubisoft Connect. If matchmaking still hangs, change your matchmaking privacy settings from Group to Public.
DELTA errors mean the server kicked you out. Check your internet stability first — run a ping test to 8.8.8.8 for 5 minutes and look for timeouts. Update your router firmware. If the error persists, flush DNS: open Command Prompt as administrator and type ipconfig /flushdns. Restart your router and wait 30 seconds before powering it back on.
Go to audio settings and select the correct input device. Windows sometimes switches default microphone automatically. Check Privacy Settings in Windows — make sure apps can access your microphone. Test your mic in Discord or Skype first to confirm it works. In-game, push-to-talk works more reliably than open mic.