Is this two way trust or one way?

if There is two way trust there is nothing to be done but if one way trust established we need to configure access to them by using the Stsadm command-line tool and selecting an account to use when accessing each forest or domain.

for better understanding refer below article from Microsoft which talks about accessing user list in SharePoint from another Domain\Forest. this will give you much better insight and what will be applicable in your configuration scenario.

https://blogs.msdn.microsoft.com/spses/2012/07/18/all-you-want-to-know-about-people-picker-in-sharepoint-functionality-configuration-troubleshooting-part-2/

let us know if this helps you or not or if you need to discuss this further..

Hi Rohit,

Thanks for your reply.

It is two way external forest trust. AD team established the trust and we are now able to locate the people but in people picker, we are still unable to search them.

So do we need to do follow below points or not? Kindly review and suggest:

1- Need to run user profile crwal in full mode

2- Need to run stsadm command to set property for AD forest

3- Need to make a connection.

Thanks for Update Rohit!

as i understand there is already two way trust established between both forests it should not be an issue.

what kind of authentication is configured between forests, is it selective or Forest wide?

With Selective authentication in place and with the Application Pool service account not having any explicit rights in place for destination Domain it wont allow to show users of destination domain in picker.

Thanks

Rohit Rai