I think I did a mess.
We had a domain (ie mydomain.it) configured on a cloudflare account
As we have a second cloudflare account, we added the same domain to the new CF account, without removing the older one. Addition was done properly, as I can see.
Then i’ve set the authoritive nameserver to the Italian Registry, but they are still in pendingValidation (usually, they are approved in realtime)
So, i’ve removed the domain from both account, starting from scratch, and I rerun the IT-NIC validation.
Same result, nameservers are not validated.
Any idea ? I thin that adding a domain already handled by cloudflare to a new cloudflare account did a mess.