Thank you very much for sending the diagnostic logs.
During Display Off in the Viewer app, could you please check in the Windows Display Settings (of your primary machine) if there’s a detached secondary display?
Then please attach it by switching it to Extend or Duplicate.
For assistance, please check the Configuration and Settings -> Windows PC (Primary Machine) chapter in the user manual https://forum.spacedesk.netuser-manual/#item_470.