A mau resource is always contained within a <Content> section. The only property is the <rasd:AllocationUnits> tag, which signifies the number of MAUs or other cryptographic units.
<Envelope> <References/> <Content xsi:type="ovf:VirtualSystem_Type" id="ldg1"> <Section xsi:type="ovf:VirtualHardwareSection_Type"> <Item> <rasd:OtherResourceType>mau</rasd:OtherResourceType> <rasd:AllocationUnits>1</rasd:AllocationUnits> </Item> </Section> </Content> </Envelope>