@Munot, Sneha Welcome to the Microsoft Q&A platform, thanks for posting the question
The error you are seeing may be related to the fact that the Azure SQL Database and the Ataccama application are on different subscriptions. By default, Azure SQL Database is configured to only allow connections from within the same subscription or from a trusted Azure service.
To allow connections from the Ataccama application, you will need to configure the firewall settings for the Azure SQL Database to allow traffic from the IP address of the Ataccama application.
Regards
Geetha