In Onpage > Analysis Manager > example.tld the message
Fehler Start-URLis shown
On Opening the Site a 301 (Redirect) HTTP Status code is returned
When checking the response header using Google DevTools does not include a location header
A 301 Status is returned, but no location header is present.
Make sure a location header is set when using redirect
Navigate to Onpage > Analysis Manager > example.tld
set all subdomains in Crawl Scope and perform a new Onpage Analysis by clicking START ANALYSIS WITH NEW SETTINGS