The following code finds all groups a given Active Directory user is member of (including nested group memberships). The code requires the ActiveDirectory module.

#requires -Module ActiveDirectory
 
function Get-NestedGroupMember
{
    param
    (
        [Parameter(Mandatory,ValueFromPipeline)]
        [string]
        $Identity
    )
 
    process
    {
        $user = Get-ADUser -Identity $Identity
        $userdn = $user.DistinguishedName
        $strFilter = "(member:1.2.840.113556.1.4.1941:=$userdn)"
        Get-ADGroup -LDAPFilter $strFilter -ResultPageSize 1000
    }
}

To find group memberships, simply run Get-NestedGroupMember with the name of a user. The function accepts the same identity information that is accepted by Get-ADUser, so you can specify a SamAccountName, a SID, a GUID, or a distinguishedName.

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