Microsoft Flow authentication error

I'm trying to create a connection from Microsoft Flow. I tried with different accounts, but same result. It opens a new windows to auth the connection, asks for user but after successfully login, it doesnt return a valid oAuth to Microsoft Flow, it does a complete login in the Adobe Acrobat Sign webpage as if I want to do login to use it from the web ...

I tried different browsers, cleaned cookies, cache, .... 

Please help, I cant use the service