Data source credentials Disabled

I'm presenting an issue with a dashboard that i published, this dashboard is getting the data from an SQL Server database, so when im trying to refresh the data from the published power bi, the following error appears: 

So then i go the Settings to check the credentials but they appear in grey and i cannot take a look to see wheres the error or if need anything else, i only have the option to take a look into the gateway connection, i dont know if i need that or what to expect.

So theres any way to enabled this step or what else i can or need to do