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Thanks for sending the diagnostic info.
Based on the logs, you have an old Intel graphics adapter with WDDM 1.1.
Desktop Duplication on primary machine is not supported if you have an old version of graphics adapter with less than WDDM 2.0 version.
Just download the latest driver version from Intel website OR if it did not work try to downgrade the graphics driver to Microsoft Basic Display driver via device manager.
Please take note that downgrading to Microsoft Basic Display driver might introduce another problem in spacedesk e.g. device error code 43 in spacedesk Graphics Adapter in device manager.
For more info please check the Troubleshooting -> Known Issues, Problems and Limitations -> Windows 10 Desktop Duplication (mirror) option not available chapter in user manual https://www.spacedesk.net/user-manual/#item_484.