If none are showing up, it is likely there's a GPO misconfiguration or firewall issue, however run through the troubleshooting steps on my guide and it will get you going. https://www.ajtek.ca/wsus/client-machines-not-reporting-to-wsus-properly/
Computers not Populated-WSUS
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Hi I have configured WSUS on server 2016. However, computers are not populated on the WSUS admin console. Any suggestion or recommendation.,