Hi,
Translation by Google Translate:
I can’t get into warzone
I can not enter Warzone, it says that the connection with the server was lost, a few days ago the same thing happened to me, today again it seems that it is when it is updated, I have tried many times and it is not possible,
You will need to contact Activision Support for this type of issue.
See this post for details: Having Problems with Call of Duty? Read this first!