RDS 2012 R2 Connection Broker HA with SQL 2014 "The database specified ine the database connection string is not available..."

Dear ,

I have the following error when I configure RDCB with SQL 2014 Std Edition on Windows 2012 R2 .

The SQL Server Native client is installed
A firewall is allowing SQL Access from the RD Connection Broker (port 1433)
The SQL Server Native Client version is specified 11
The TCP/IP protocle in SQL Server NetWork Configuration configured TCP Port 1433 and TCP Dynamics Ports is blank for all ip
An correct SQL Server name is specified
I add RDS Connection Broker groupe in SQL server (DB creator)
I configure ODBC and Test is successfully

DRIVER=SQL Server Native Client 11.0;SERVER=SQLServerName;Trusted_Connection=Yes;APP=Remote Desktop Services Connection Broker;DATABASE=RDCBDB

Thanks for your help.