If the client is not properly reporting to WSUS server, run the following to reset the registration from client side \\

<cli>Stop-Service -Name BITS, wuauserv -Force
Remove-ItemProperty -Name AccountDomainSid, PingID, SusClientId, SusClientIDValidation -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\ -ErrorAction SilentlyContinue
Remove-Item "$env:SystemRoot\SoftwareDistribution\" -Recurse -Force -ErrorAction SilentlyContinue
Start-Service -Name BITS, wuauserv
wuauclt /resetauthorization /detectnow
(New-Object -ComObject Microsoft.Update.AutoUpdate).DetectNow()
UsoClient.exe StartInteractiveScan</cli>

Script from troubleshooting guide: https://www.ajtek.ca/wsus/client-machines-not-reporting-to-wsus-properly/