Nginx proxy configuration not working with nextcloud docker container

Question

my proxy configuration is not working on Nginx . I have a docker nextcloud Container running on 10.0.100.6 and can access it through 10.0.100.6:8080 but if want to access it through /nextcloud its not working. nginx error . i can access the nginx standart page

server {
  listen 80;
  listen [::]:80;
  server_name localhost;

  location / {
    root /usr/share/nginx/html;
    index index.html index.htm;
  }

  location /nextcloud {
    proxy_pass http://10.0.100.6:8080/;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
  }

  error_page 500 502 503 504 /50x.html;
  location = /50x.html {
    root /usr/share/nginx/html;
  }
}

even tried the proxypass deleting all other options But same story. Not working :(

location /nextcloud {
  proxy_pass http://10.0.100.6:8080/;
}

nginx syntax checker says everthing ok .