For us too WMI probing improved the situation. However, some (older) pc still had local Windows firewalls active, by default it did not allow the probing.
We took the quick and dirty fix: disabled Windows firewall with group policy when connected to the domain.
i think wmi/netbios probing does not work if the client machine is a non windows based,e.g. Mac book
Pa should consider to read logoff event to solve this problem, cannot 100% but at least 95%
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