Organization / Provider Fax Number

How do I update the fax number for an organization and provider? Where can I find the fax number in Corrigo Web for these entities?

When I try to create a contactinfo using the CreateCommand below, I'm getting an error.

  <commandRequest xsi:type="CreateCommand">
    <Entity xsi:type="ContactInfo">
        <AddrTypeId>Fax</AddrTypeId>
        <Address>8564327</Address>
        <ActorId>6571</ActorId>
        <ActorTypeId>Org</ActorTypeId>
        <IsAlert>false</IsAlert>
        <IsReport>false</IsReport>
    </Entity>
  </commandRequest>

0Contact Address 'Fax' is not supported for object type OrgCorrigo.Core.CorrigoCoreException

Thanks,
Chloe