Hello M M
The ISO image is not available through public download links; it must be obtained via the Microsoft Volume Licensing Service Center (VLSC) or through your OEM/embedded distributor. If your organization has a valid license agreement, you can sign in to the VLSC and download the ISO directly. Alternatively, if your license was purchased through an OEM partner, the ISO and product key are provided by that partner.
For official guidance, please refer to Microsoft Learn documentation: Windows 10 IoT Enterprise LTSC 2021 Overview. If you encounter issues accessing the ISO, I recommend opening a support case through the Microsoft Support portal so the team can validate your entitlement and assist with the download.
I hope this clarifies the process 🙂. If you find this answer helpful, please click “Accept Answer” so others can benefit from the solution as well.
Harry.