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Put the following into a .bat file and run

wsus.bat:
secedit /refreshpolicy machine_policy /enforce
gpupdate
reg delete HKLMSOFTWAREMicrosoftWindowsCurrentVersionWindowsUpdate /v AccountDomainSid /f
reg delete HKLMSOFTWAREMicrosoftWindowsCurrentVersionWindowsUpdate /v PingID /f
reg delete HKLMSOFTWAREMicrosoftWindowsCurrentVersionWindowsUpdate /v SusClientId /f
cls
@echo Triggering detection after resetting WSUS client identity
net stop wuauserv
net start wuauserv
wuauclt /resetauthorization /detectnow