It appears Clarity SAAS can connect to REST (ODATA) endpoints. How can Clarity on-premise users use MS power BI to connect to these REST endpoints?
The OData access feature (HDP Connectors) to Datawarehouse is an option that is only coded for the Clarity SAAS environments and consumed by for Clarity SAAS customers, and currently there are no plans to extend this feature for the clarity on-premise customers.
If the requirements is to connect to MS BI to the Database Data sources you could perhaps connect the same directly. On-premise customers would have direct access to the their DBs so really do not need the route taken by clarity SAAS customer.