Regardless of the method used to deploy a secondary site, you should verify that the secondary site was installed successfully.
To verify successful secondary site installation
On the secondary site computer, verify that the installation was successful by reviewing the ConfigMgrSetup.log and ConfigMgrPrereq.log log files. These files are located at the root of the system drive on the secondary site computer.
On the primary site server computer, open the Configuration Manager console and navigate to System Center Configuration Manager / Site Database / Site Management / <site code> - <site name>.
In the results pane, verify that the secondary site's information is displayed.