Integrated security means that the query will be executed with the account running the service who try to execute it, in your case, PAM's account. (this is not always true but in your case it is).
If you always connect to the same sql instance, let me suggest to configure it in the module section of the configuration of your domain.
If not, you can remove the ;integratedSecurity=true from your connection string, and provide the username and password in the corresponding field of your operator.
Alternatively, you can specify the username and password in the connection string, but I'm not sure if PAM support this one, didn't try it.
: Server=myServerAddress;Database=myDataBase;User Id=myUsername;Password=myPassword;
PS : If you try to connect to a different DataBase system that the one PAM is installed on, you will need to deploy the corresponding driver, take a look at the installation guide for assistance. But if you we're trying too, you should have get an error saying : unable to load driver for XXXX.
Good luck