Azure DNS private zones preview API is being deprecated

During public preview release, private DNS zones were created using dnszones ARM resource with zoneType property set to Private. The GA resource model makes use of privateDnsZones resource type instead of dnszones. Support for zones created using the preview API will be completely removed on June 30, 2020 and you must immediately migrate these private DNS zones to the latest resource model.
Source: Microsoft Azure – aggiornamenti