Hello Paul Austin1,
Thank you for posting in Microsoft Community forum.
Is this equivalent as to a GPO? But GPOs are linked to OUs but "Password Setting Container" is linked to AD Security groups?
A: Yes, this is similar to GPO, but password policy within Default Domain Policy, it applies to all the machines in the domain. FGPP (Fine grained Password Policy) applies to domain users or domain groups, and FGPP takes precedence over domain password policy.
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Best Regards,
Daisy Zhou