As part of our efforts to improve security in the cloud, we have removed the option to create unsecure Azure Service Fabric clusters from portal. In its place, we added a simplified process for creating secure Service Fabric clusters. You can create a certificate from the portal during the Service Fabric creation experience, from a new or existing key vault.
When you create a Service Fabric cluster through portal, you now see the new Basic experience by default. If you want all of the advanced certificate functionality and options, select the Custom option.