Configure SharePoint People Picker to include One-way trusted domains

If you have multiple one-way trusted domains in your SharePoint environment, you should explicitly configure people picker control. Otherwise users from those domains will not be searched.
To configure the people picker you need to follow these steps.

Configure encryption key
You need to type below command in each WFE servers

STSADM.exe -o setapppassword -password "key"

Configure people picker
Then you need to execute below command with privileged user for each domain. This command will configure people picker per web application and zone.

STSADM.exe -o setproperty -pn peoplepicker-searchadforests -pv "forest:sp.local;domain:apac.contoso.com,apac\user,*****;domain:emeia.contoso.com,emeia\user,*****" -url https://www.sp13

That’s all !. Now you can  search for users in one-way trusted domains in your people picker