Hey, that error is a network related error. There are a few things you can try to see if it helps:
-Try to clear the cache on your system, refresh your router, and try with a wired connection (if possible). If you need assistance with clearing the cache you can head here: https://support.activision.com/articles/en_US/FAQ/Deleting-Old-Files-from-PlayStation-4-and-Xbox-One...
-Check to see if your NAT type is Open in the games networks settings. If it shows as Strict or Moderate you can try to port forward to open it. If you have access to your router you can head here, it can help guide you on doing so: https://support.activision.com/articles/en_US/FAQ/Port-Forward-and-NAT-FAQ
If you'd prefer you can as well contact your Internet Service Provider for assistance with port forwarding.
-If your NAT type is Open you can try to change the DNS settings on your system to Google or Cloudfare DNS
If after trying these steps you continue to run into the same issue you can reach out to official support. They should be able to offer you any more tips and assistance:
Contact Us (Live Chat):https://support.activision.com/contact_us
Twitter Assistance: https://twitter.com/ATVIAssist
Facebook Assistance: https://www.facebook.com/ActivisionAssist?fref=ts
The live chat hours with an Activision agent on the contact us page are from 11a.m. - 7p.m. Pacific Standard Time