Added the NS records to my registrar DNS configuration 1 month ago.
The configuration has not been updated since.
The technical service has not ever answered or resolved the issue.
What feature, service or problem is this related to?
More details:
I have my AUTCODE available.
Is there a way to transfer the domain directly to Cloudflare without all the hassle with the DNS configuration at my provider (tiscali.it)?
You need to make the nameserver change at your registrar (seemingly “Ascio” in your case), not at your current DNS provider (which seems to be “Tiscali”).
You could also transfer the domain from Ascio to Cloudflare Registrar entirely, which would take care of the nameserver changes for you.