Could you please open the spacedesk Driver Console (just click the spacedeks tray icon in the task bar), click Diagnostics -> Save All Information.
Saving all information will take a few seconds, then please send us the whole folder which contains all the diagnostic logs collected.
Please right-click the folder -> Send to -> Compressed (zipped) folder, then attach the *.zip file on your next reply.
By the way, can you also tell us which spacedesk Viewer app are you using? Android/iOS/Windows/HTML5?
Thank you very much for sending the diagnostic logs.
Log shows that there is an active VPN (Virtual Private Network)
MBTun Userspace Tunnel #3/10.67.225.171/53
Maybe this is the VPN of the installed Malwarebytes Antivirus software?
That’s expected as long as this VPN (MBTun Userspace Tunnel #3/10.67.225.171/53) is active on your primary machine it might prevent spacedesk from network discovery.
Another thing you can try is to add “C:\Windows\system32\spacedeskService.exe” into the “Allow List” of your Malwarebytes settings to exclude spacedesk from all detections.