Query Timeout means BattlEye can't establish a (stable) connection with its own server (to check for updates. Other problems may be connected to having other anticheat software (services) running

Of course, the BattlEye FAQ was no help for the "Query Failed" errors I was getting. For others searching for a solution: I have done a few fixes, and the issue hasn't immediately reoccurred. The issue was intermittent anyhow, so it's not certain that what I did was the causal solution, but FWIW: 1. Uninstall and reinstall D2 Battleye Go the Destiny's installation folder (Steam -> Library -> Destiny right-click -> Manage -> Browse Local Files, surely something equivalent in Epic), then the "battleye" folder therein run "Uninstall_BattlEye.bat" then "Install_BattlEye.bat" 2. Add various BEService executables to the Windows Defender Firewall (Windows 10) These instructions apply to Windows 10; probably there's an equivalent for Win11. Win key then type "Firewall" to search for the "Windows Defender Firewall" Control Panel, or alternatively Settings -> Network & Internet -> Windows Firewall (small at the bottom of the window, between "View hardware and connection properties" and "Network reset") -> "Allow an app through firewall". Unlock as Administrator, then "Allow another app" and browse to "C:\Program Files (x86)\Common Files\BattlEye" and select "BEService_d2.exe". Do it again to select "BEService.exe" 3. Sacrifice a chicken I dunno, maybe it'll help? (Not The Colonel obviously)