You may have encountered the error below in the AR events, when configuring the AR service account with credentials which inherit SQL permissions from an AD group.
“Critical error occurred upon starting Active Roles Administration Service.
Details: Database 'AR_DB' on SQL Server 'xxxxx.DOMAIN' is unavailable.
Ensure that the Administration Service's login is mapped to a database user with the default schema of 'dbo' in the Active Roles database.”
This is a product defect (TF00170694).
Use a Windows user which has with sufficient direct permissions (not one that inherits those via AD group) to perform Administration Service installation tasks in the SQL DB. For a list of permissions, see “SQL Server permission/Configuration permissions” in the Active Roles Quick Start Guide.
This will be fixed on a future release of the product. Please refer to this article for updates or contact support referencing the defect ID TF00170694.