“You’re correct that Microsoft is deprecating the Windows Authenticated Scan feature in Defender Vulnerability Management, with support ending on November 30, 2025. Currently, there isn’t a direct replacement within Defender for conducting remote scans on unmanaged Windows devices without enrolling them. Like”

https://learn.microsoft.com/en-us/defender-vulnerability-management/defender-vulnerability-management-faq

Replacement services

Best Network Management Software Solution – Auvik Networks

Domotz | Network and IT infrastructure Monitoring software

Zabbix :: The Enterprise-Class Open Source Network Monitoring Solution