Gateway-postgres-credential

Hi guy,

I'm facing an issues with my report and the gateway on powerbi service, everytime it says that I need to enter the credential, however those credentials are the same one I used on powerbi desktop. I'm on this issues for like a week with no solution ahead.

On the server I use 'localhost' and the port number, and even use the ip of my laptop (I don't know if I have to use both of them at the same time or not)
On the username I enter 'postgres' (here I dont know if this is correct or not)
On the password I enter the same one I used to connect the database to the report on powerbi dektop 

And even after that, I get this error:

Even if I click on "skip test connection" it doesn't work at all.

I'd would appreciate any help. Thanks