After starting the Hyland Login Service the first time, it will automatically create a new application named "Windows" (or the name you modified in the AM.LoginService.Host.exe.config file). This application is used to manage the Windows credentials for the clients.
Please use the System Table Credentials in the Hyland RPA Manager and select the application mentioned above to administrate username and password to allow the Hyland Login Service to log in automatically. See About the Credentials View in the Hyland RPA Manager documentation for more information.
The username must be in the format <DOMAIN/COMPUTERNAME>\<USERNAME>. Example: Your Windows Domain is named ANOTHERMONDAY and you want to login the user testuser you need to enter ANOTHERMONDAY\testuser into the username field.