Office 365 ProPlus installed from network still getting updates from the internet

I installed click-to-run Office 365 ProPlus on all of our machines from a local network share. The files were downloaded using the Office Deployment Tool, and I set up my configuration.xml to install updates from the network. However, all of the workstations appear to still be downloading updates from the internet rather than from the network share. Hoping someone can explain to me what I've done wrong...

Here are my configuration.xml file contents:

<Configuration>

  <Add SourcePath="\\server\Share\Microsoft\O365ProPlusRetail\" OfficeClientEdition="32" >
    <Product ID="O365ProPlusRetail">
      <Language ID="en-us" />
    </Product>
  </Add>

  <Updates Enabled="TRUE" UpdatePath="\\server\Share\Microsoft\O365ProPlusRetail\" />

  <Display Level="Full" AcceptEULA="TRUE" />

  <!--  <Logging Name="OfficeSetup.txt" Path="%temp%" />  -->

  <Property Name="AUTOACTIVATE" Value="1" />

</Configuration>

Shaun