I have only one Domain controller, i changed Minimum password Length to 8 in GP management console in Default Domain policy and ran from Domain controller:
get-addefaultdomainpasswordpolicy -Identity ad.contoso.com
ComplexityEnabled : True
DistinguishedName : DC=ad,DC=contoso,DC=com
LockoutDuration : 00:30:00
LockoutObservationWindow : 00:30:00
LockoutThreshold : 3
MaxPasswordAge : 00:00:00.0000030
MinPasswordAge : 00:00:00.0000001
MinPasswordLength : 10
objectClass : {domainDNS}
objectGuid : a8753e24-871a-40b2-969a-e44528f21be6
PasswordHistoryCount : 14
ReversibleEncryptionEnabled : False
But, powershell returns old data, i rebooted server, ran gpupdate /force but nothing. Is there any delay or i have some problem ?