Return
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Title
Managing a domain that is not a Managed Domain -
Description
You are unable to see a domain that is not part of the 'Managed Domains' but is trusted.
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Cause
by design
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Resolution
Although you can't see the non-managed domain when browsing, you can type out the syntax of 'domain\user' and select 'Check Names', it will resolve and you can successfully add the user.