We have configured the Azure Hybrid Connection in the App Service which we want to access the SQL Server Analysis Services from On-Prem server. The port configured in Hybrid Connection is 2383. The connection status is showing connected on both the Azure and in the Hybrid Connection Manager of the On-Prem server. But when we run the application it is throwing A connection cannot be made. Ensure that the server is running.
Most probably you might be having issue with TLS version that is currently enabled on your on-premises server. A detailed article on how to tackle each and every problem that you might be facing with the HCM can be found here.
Hope this might be sufficient to solve all your problems.