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Try something like this

Connect-VIServer -Server $vcenter -Credential $AdminCredential | Out-Null

Get-VMHost -PipelineVariable esx |
ForEach-Object -Process {
    $accessMgr = Get-View -Id $esx.ExtensionData.ConfigManager.hostAccessManager
    if ($accessMgr.LockdownMode -in [VMware.Vim.HostLockdownMode]::lockdownNormal,[VMware.Vim.HostLockdownMode]::lockdownStrict) {
        $accessMgr.ChangeLockdownMode([VMware.Vim.HostLockdownMode]::lockdownDisabled)
    }
}

Disconnect-VIServer -Server $vcenter -Force -confirm:$false