Redirect loop

What this means

This URL's redirect path visits the same address twice, so it never settles on a real page. Googlebot abandons a looping URL and the content behind it can never be indexed.

How to fix it

Trace the redirect rules for this path and remove the rule that sends the request back to an address it already visited. Redirect once, straight to the final destination.

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/301-redirects