When deploying a new 9.0 vSAN witness via the OVF the configuration settings are not transferring to the host upon creation
vSAN 9.0
Console into the vSAN witness VM to configure the witness management network information
Once the management network is added connect to the host via the hostUI or add it to vCenter and follow the information contained with the documentation to manually configure the vSAN witness network configuration:
Deploying a witness appliance for a vSAN 9.0 stretch cluster