Those 3 glue records are pointing at the IP addresses associated with the vanity NS’ at Cloudflare which we’ve configured at an account level.
Toshiba.de, however, is ‘active’ in CF but is using the exact same NS values as toshiba.at! I’m not sure why there was be discrepancy given they’re shared NS values.
In addition, I know the zone for toshiba.at is active as if I remove it completely the main website goes offline (no local DNS in place), and by reinstating the zone in CF the site(s) are then active again!
toshiba.at is missing one of the 4 nameservers at the registrar.
One other thing I notice is that ns1, ns2, n3, ns4 are being de-proxied by Cloudflare (they start _dc-mx in the DNS for toshiba-europe.com). Do you have a record for these that’s pointing at a proxied record?