Google’s John Mueller discussed a technical SEO fact about domains and subdomains, which may cause a site to appear unindexed. The user created a website using Core MVC and published it under HTTPS.

The web application framework and HTTPS protocol are known variables in a scenario, potentially interfering with content indexing or affecting the HTTPS configuration.

There’s always more than what is seen

The best approach to solving SEO problems is to continuously search for solutions, even if the issue is not immediately apparent.

WWW is a subdomain

The solution’s identification serves as a reminder of the technical fact that the www and non-www versions of a website are subdomains.