Nginx Proxy Manager: Custom locations don't work

[Iacov]

i have asked bing chat/copilot to translate the code snippets into code for the "advanced" tab...i unfortunately lack the skill to a) assess if the code is correct and b) the knowledge to verify wether the code works
the proxy client is green/online though

Code:

location /socket {
    # Proxy Jellyfin Websockets traffic
    proxy_set_header Connection "upgrade";
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-Protocol $scheme;
    proxy_set_header X-Forwarded-Host $http_host;
   
    # Security / XSS Mitigation Headers
    # NOTE: X-Frame-Options may cause issues with the webOS app
    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-XSS-Protection "0";
    add_header X-Content-Type-Options "nosniff";

    # Content Security Policy
    # See: https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
    # Enforces https content and restricts JS/CSS to origin
    # External Javascript (such as cast_sender.js for Chromecast) must be whitelisted.
    # NOTE: The default CSP headers may cause issues with the webOS app
    #add_header Content-Security-Policy "default-src https: data: blob: http://image.tmdb.org; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline' https://www.gstatic.com/cv/js/sender/v1/cast_sender.js https://www.gstatic.com/eureka/clank/95/cast_sender.js https://www.gstatic.com/eureka/clank/96/cast_sender.js https://www.gstatic.com/eureka/clank/97/cast_sender.js https://www.youtube.com blob:; worker-src 'self' blob:; connect-src 'self'; object-src 'none'; frame-ancestors 'self'";
}
location / {
    # Proxy main Jellyfin traffic
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-Protocol $scheme;
    proxy_set_header X-Forwarded-Host $http_host;
    proxy_headers_hash_max_size 2048;
    proxy_headers_hash_bucket_size 128;
   
    # Security / XSS Mitigation Headers
    # NOTE: X-Frame-Options may cause issues with the webOS app
    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-XSS-Protection "0";
    add_header X-Content-Type-Options "nosniff";

    # Content Security Policy
    # See: https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
    # Enforces https content and restricts JS/CSS to origin
    # External Javascript (such as cast_sender.js for Chromecast) must be whitelisted.
    # NOTE: The default CSP headers may cause issues with the webOS app
    #add_header Content-Security-Policy "default-src https: data: blob: http://image.tmdb.org; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline' https://www.gstatic.com/cv/js/sender/v1/cast_sender.js https://www.gstatic.com/eureka/clank/95/cast_sender.js https://www.gstatic.com/eureka/clank/96/cast_sender.js https://www.gstatic.com/eureka/clank/97/cast_sender.js https://www.youtube.com blob:; worker-src 'self' blob:; connect-src 'self'; object-src 'none'; frame-ancestors 'self'";
}

will edit with a picture of the detail page
detail site is attached - but i don't think that i messed up there, as using jellyfin and streaming a movie worked

btw, why are the custom locations for / and /socket needed?

edit2: the "rewritten" custom location does not work...the client is online, but i end up on the "welcome to openresty" page