nginx proxy_pass doesn't work in wordpress admin and returns 404

I tried your solution, even though admin page is showing but login form is not working,

My Code

upstream blog{
    server wordpress:80;
}

upstream client{
    server frontend:8080;
}


server{
    listen 80;

    location / {
        proxy_pass http://client;
    }

# to enable hot reloading 
    location /sockjs-node {
        proxy_pass http://client;

        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
    }

    location ^~ /blog {

        rewrite /blog/(.*) /$1  break;
        proxy_http_version 1.1;
       proxy_set_header Host $http_host;
        proxy_request_buffering off; # Disable any internal request  bufferring.
        proxy_pass http://blog;
        server_name_in_redirect off;# I tried by commenting it out but nothing works
     #   proxy_set_header Host $host:$server_port;

    }


 
}