Unable to connect to instance with SQL plugin

Hello,

I've read the documentation and searched for answers and comments, but still can't get my SQL plugin connecting to the SQL Server.

I have tried so many accounts and configurations, but nothing works. The client is running with a full access account, and the users I'm trying to use have all the privileges and roles on the database. However, whatever I input as credentials, I still get the "Unable to connect to instance", and no other trace.

My Netvault is 13.0.2.14 on Windows Server 2019 Storage, the plugin is 12.2.0.12. The client is a Windows Server 2019 hosting a SQL Server 2012.

Does someone have any clue?

Thank you so much.