The customer needs to bring an User account from another domain so he can assigned it to a Security Role on the SMP Console. He had created the User under SMP Console>Settings>Security>Account Management>Accounts>Add. His problem is that it only allows him to enter users from the Main domain. When he tries to associate the Windows account to the one that he created, he gets:
"The specified User is invalid"
The trust relationship configuration has been made between all the domains that are managed on this SMP server.
ITMS 8.5, 8.6
It is necessary to bring the account reference from AD.
Users imported by a “User” AD Import rule should not be mistaken for accounts that get created in the console manually and associated with a “Windows” user. An imported user and a created user account could theoretically have the same name. The user account in the console will maintain its association to the Windows account unless the user is removed from AD.
A “Role and Account AD Import rule” is needed to import security groups and their membership as roles and accounts into the database. A ”Role and Account” rule will create roles for each imported security group and its membership as “Accounts”. These “Accounts” are also included in the role’s membership.
The AD Import process supports creating Role and Account resources based on Groups and Users in Microsoft Active Directory.
Role resources are created for each Group imported from AD, and Account and Windows Credential resources are created for each User imported from AD.
Also, the memberships of the group in AD are also imported.
In order to bring the User account reference from the other domain, you need to import domain groups and users from Active Directory:
181440 "Active Directory Import FAQ"