Cross domain users and groups are not available in the VAS cache.
This is because VAS has yet to be configured to look for users in domain other than the domain it has been joined to. In order to cache the alternate domains you need to set 2 configuration options in your vas.conf.
For more information regarding the configuration please refer to the vas.conf mainpage or the product documentation.
Configure the following two options in your vas.conf . This can also be configured through Vintela Group Policy (VGP).
group-search-path = OU=UNIX,DC=domain-one,DC=com;OU=UNIX,DC=domain-two,DC=com
user-search-path = OU=UNIX,DC=domain-one,DC=com;OU=UNIX,DC=domain-two,DC=com