You must update the Application Server web.config file to specify which SMART on FHIR application configuration the Application Server should use when performing SMART on FHIR authentication. This setting can be found in the <configuration>|<appsettings> section of the Application Server's web.config file.
<configuration>
<appSettings>
<add key="DocLinkerSMARTonFHIRApplicationId" value="[GUID]" />
</configuration>
The value for the GUID can be found in the Application Unique ID field in the Application Server Settings dialog box. See the SMART on FHIR documentation for more information.