Unable to connect to Data Flow

Hi everyone,

Everything was fine, then out of a sudden - and without any change on the BI report -, my dataflow connection stopped working.

Now, when I'm trying to connect to the data flow (from power query), i get this:

And when I click on connexion, i get this:

Traduction: Sorry.. We couldn't establish a connexion. Delete the credentials infos and try again later.

That's what I did, i deleted all the credentials info, I restarted everything, i tried everything I knew. And it's still not working.

I looked it up online, but i couldn't find any information.

I have a pro licence (not on free trial).

Please help, i'm stuck.