Suddenly disconnected and can't login again

While playing Warzone, I got a server disconnected error in the middle of the game. My account was logged out, when I try to login again I get an error “We can’t find that blizzard account”. I also cannot write to support because I also get an “account not found” error there. I can login to my Activision account with the same email and password and my Blizzard account appears to be “linked”. What happened to my account?
I don’t have Blizzard account for this warzone account, it was linked with blizzard on activision.

Hey there SuperNinja,

When it comes to the Call of Duty games, Blizzard Technical Support is only able to offer support for installation and patching. For issues logging into the game, please contact Activision Support.