Product : Microsoft Corp, Azure Stack/1903, IaaS + PaaS
Feature : Internet of Things, Analytics and IoT, Platform Services
Content Owner:  Bhagyashri (Shri) Bhagvat
Summary
Not much documentation out there but there appears to be a private preview for IoT Hub on Azure Stack which is fairly recent
Details
https://azure.microsoft.com/en-us/resources/iot-hub-on-azure-stack-third-party-notice/en-us/