Could you please whitelist the following SPARQL endpoint:
https://digitale.bncf.firenze.sbn.it/openrdf-workbench/repositories/NS/query
This is a SPARQL endpoint used by https://thes.bncf.firenze.sbn.it/ (https://www.wikidata.org/wiki/Q16583225), the most important controlled vocabulary in Italian language, both linking to Wikidata and linked from Wikidata (cf. https://www.wikidata.org/wiki/Wikidata:SPARQL_federation_input#BNCF).