Follow the steps on our support article if you're having connection problems with the Blizzard Battle.net desktop app.
If you're experiencing connection issues with the game client, check Bungie's Network Troubleshooting Guide and Networking forum.
Troubleshooting steps for connection problems
Game or Blizzard services connection error BLZBNTAGT00000BB8
Troubleshooting steps to install or patch Destiny 2
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