To add a new domain to the existing instance of ADSelfService Plus, please follow the steps below:
Log in to ADSelfService Plus using ADSelfService Plus admin credentials.
Click on Domain Settings in the top right corner of the application.
Click the Add a New Domain button to add a new domain.
The Add Domain Details pop-up box will appear on the screen.
Fill in the domain name and add the Domain Controllers.
Enable authentication and update the credentials.
Click on the Add button to complete the process.
The new domain will now be added to the existing instance of ADSelfService Plus.