My Samsung A7 lite cannot detect any primary machine from my HP laptop. I have checked the connection, I used the same hotspot. Plus, there is also no third party. Here is my diagnostics file regarding my laptop.
Please refer to the Troubleshooting chapter of our documentation and check the topic, “Cannot discover Primary Machine” (https://www.spacedesk.net/user-manual/#item_490). If this does not help, please try to switch the network profile to Private.