Restart Rainbow Six Siege
Restart Ubisoft Connect
Restart your PC or console
Check your internet connection
Use a wired connection
Disable VPN or proxy
Verify game files
Clear Ubisoft Connect cache
Update Rainbow Six Siege
Update Ubisoft Connect
Update your system software
Log out and log back into Ubisoft Connect
Set DNS to Google DNS or Cloudflare DNS
Flush DNS on PC
Reset network settings
Allow Siege and Ubisoft Connect through firewall
Disable antivirus temporarily
Change NAT type to Open
Close background apps using bandwidth
Reinstall Ubisoft Connect
Reinstall Rainbow Six Siege
Check Ubisoft server status
Wait and try again later