Wordpress リバースプロキシの設定（Nginx）

実現したいこと

Nginxのリバースプロキシ環境課でWordPressを動かしたいのですが、ログイン画面が404エラーになってしまう。

環境はこんな感じ
WAN
↓
Nginx(192.168.200.100)
↓
Nginx wordpress (192.168.200.151)
/var/www/html/wordpress（とりあえずこっちにアクセスしたい）
/var/www/html/wordpress02
/var/www/html/wordpress03

Nginx(192.168.200.100)側のconfig

server {
        root /var/www/html;

        # Add index.php to the list if you are using PHP
        index index.html index.htm index.nginx-debian.html index.html index.php;

        #listen 80;
        listen [::]:443 ssl; # managed by Certbot
        listen 443 ssl;
        ssl_certificate /etc/letsencrypt/live/<ドメイン名>/fullchain.pem; # managed by Certbot
        ssl_certificate_key /etc/letsencrypt/live/<ドメイン名>/privkey.pem; # managed by Certbot

        server_name <ドメイン名>;
                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection 'upgrade';
                proxy_set_header Host $host;
                proxy_cache_bypass $http_upgrade;
                proxy_set_header X-Forwarded-Proto https;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "upgrade";

        location / {
                proxy_pass http://192.168.200.151/wordpress/;
        }


        # pass PHP scripts to FastCGI server
        location ~ \.php$ {
                include snippets/fastcgi-php.conf;
                fastcgi_pass unix:/run/php/php8.1-fpm.sock;
        }
}

map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}

Nginx wordpress (192.168.200.151)側のconfig

server {
        listen 80 default_server;
        listen [::]:80 default_server;
        server_name _;

        index index.html index.htm index.nginx-debian.html index.php;
        client_max_body_size 3G;

        root /var/www/html/;

        location / {
                try_files $uri $uri/ /wordpress/index.php?$args;
        }

        location ~ \.php$ {
                include snippets/fastcgi-php.conf;
                fastcgi_pass unix:/run/php/php8.1-fpm.sock;
        }
}

wp-config.php 追記分

define('FORCE_SSL_ADMIN', true);
if (strpos($_SERVER['HTTP_X_FORWARDED_PROTO'], 'https') !== false){
    $_SERVER['HTTPS'] = 'on';
    $_SERVER['SERVER_PORT'] = 443;
}
if (isset($_SERVER['HTTP_X_FORWARDED_HOST'])) {
    $_SERVER['HTTP_HOST'] = $_SERVER['HTTP_X_FORWARDED_HOST'];
}