Inconsistent www / non-www redirects

What this means

This URL's redirect path crosses the www boundary of the same domain more than once, or handles the www change and the http→https change in separate hops. That is the signature of two rewrite rules fighting each other: it adds needless hops and splits ranking signals across host variants.

How to fix it

Consolidate to one rule that sends every variant to the canonical host and scheme in a single 301 hop, and make sure the host rule and the HTTPS rule are applied together rather than one after the other.

Fix effort

This check needs a developer fix: it turns on a routing, hosting or infrastructure decision that no automatic edit can make safely.

Authoritative source

https://developers.google.com/search/docs/crawling-indexing/consolidate-duplicate-urls