Nginx configuration for allow ip is not working deny all is working fine

i create a new conf file to block all public ip to access and give only one public ip address(office public IP) to access. but when i try to access its shows the "403 Forbidden nginx"

    upstream backend_solr {
         ip_hash;
         server ip_address:port; 
} 
server {
         listen 80;
         server_name www.example.com;

         index /example/admin.html;

         charset utf-8;
         access_log /var/log/nginx/example_access.log main;

         location / {

            allow **office_public_ip**;
            deny all;
            proxy_pass  http://backend_solr-01/;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         }

        location ~ /favicon\.ico {
            root html;
        }

        location ~ /\. {
            deny all;
        }}

but in the logs it shows accessing to the public ip but forbidden

IP_Address - - [31/Jul/2017:12:43:05 +0800] "Get /example/admin.html HTTP/1.0" www.example.com "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36" "my_office _IP" "-" "-" "-" 403 564 0.000 - - -