Azure Virtual Desktop: Session Host Unavailability Despite Power State — Domain Join and Health Check Issues

Problem description

I am facing an issue where my Azure Virtual Desktop session hosts are powered on, but their health state is marked as unavailable. The only error message I have is related to a domain join check, indicating that the session host may not be properly domain joined or that there's a trust issue. This problem affects multiple users daily, and I cannot connect to the VDI.

Environment

An Azure Virtual Desktop session-host deployment with multiple hosts in a host pool. The affected hosts are powered on, but their health status shows as unavailable. No specific region, SKU, or resource names are provided.

What I've already tried

I have reviewed the support case details and the guidance related to domain join failures. I have not performed any specific troubleshooting steps, configuration changes, or log reviews beyond the initial support review.

Current status

Currently, the session hosts are still marked as unavailable in Azure Virtual Desktop, despite being powered on. The only known issue is the domain join health check failure. I am seeking assistance to diagnose and resolve the domain join or trust issues to restore host health status and enable user connections.