database connection issue with workflow designer

Hello, I wish someone can help me on this issue: 

 

 

I need to connect to an Azure SQL database for a server-side workflow. In the Run SQL Query activity, I set Provider Name to be Microsoft SQL Server, and set Connection String to be Data Source=<company>.database.windows.net,1433;Initial Catalog=<Database Name>;Integrated Security=False;User ID=<Username>;Password=<password>, but when I ran the workflow in Sandbox, F12 shows me the error that "Login Failed for user <Username>". 

 

 

However, I am able to establish a connection in Geocortex Essential Manager using the same connection string (same user and same password),  and I am also able to connect as well using the same user credentials in Microsoft SQL Server Management Studio.  What could I have done wrong in the Workflow Designer then?

 

 

Thanks,

 

Jie