What is the fastest diagnostic order when an important page is not getting indexed?

Diagnose indexing as a funnel: URL existence -> crawl access -> renderability -> canonical eligibility -> content value -> discovery/signals.

1. Confirm the exact URL returns a stable 200 response. Check redirects, soft-404 behavior, authentication, geofencing, and intermittent server errors.

2. Check robots controls at every layer: robots.txt, meta robots, X-Robots-Tag, CMS settings, and environment-specific rules.

3. Verify the canonical. The page should not point to another URL unless consolidation is intentional. Also confirm the destination canonical is itself indexable.

4. Inspect the rendered page. Make sure the primary content exists after rendering, internal links are crawlable, and the page is not an empty application shell when scripts fail.

5. Check discovery. The URL should be linked from relevant indexable pages and included in the XML sitemap when appropriate. Orphan pages can take much longer to be found or understood.

6. Evaluate duplication and value. If the page is extremely similar to existing pages, has little unique information, or represents a low-value parameter combination, technical eligibility alone may not earn indexing.

7. Use Search Console URL Inspection and server logs to determine whether Google has discovered and crawled the URL, and what canonical it selected.

Only after those checks should you use Request Indexing. Requesting another crawl does not fix a page that is blocked, canonicalized away, duplicated, or poorly connected to the site.