A meta robots tag or X-Robots-Tag header instructs crawlers not to index this URL.
Consequence. The page will be dropped from search results. That is the correct mechanism for removing a page — worth confirming it is intended for this URL.
If that is not intended. If the page should rank, remove the noindex directive. Keep the URL crawlable either way, since a crawler must fetch the page to see the change.
Consequence. Crawlers have to discover every URL by following links. Pages that are deep, newly published, or poorly linked internally take longer to be found, and some may never be. A sitemap is the most direct way to hand a crawler the full list.
If that is not intended. Publish an XML sitemap and declare it with an absolute URL, e.g. "Sitemap: https://example.com/sitemap.xml". The line is global — it belongs outside any User-agent group and applies to every crawler.
Pass
Search engines can reach the site
All 6 checked search engines are allowed at the site root.
Pass
AI answer engines can reach the site
All 4 checked AI answer engines are allowed at the site root.
Pass
User-triggered AI fetches can reach the site
All 3 checked user-triggered AI fetches are allowed at the site root.
Pass
Social link previews can reach the site
All 5 checked social link previews are allowed at the site root.
Pass
AI training crawlers can reach the site
All 6 checked AI training crawlers are allowed at the site root.
Pass
No syntax problems
Every line parses as a directive crawlers understand.
Pass
File size is 213 bytes
Comfortably within the 500 KB that crawlers will read.