Trying to add integration "Facebook Advertising"

Hi,

I’m trying to add the Facebook Advertising integration, but without luck.

I’m clicking on the “Connect to Facebook Advertising”-button. Next step is to login to my Facebook account. I enter all my details and press ‘login’. 
Right after that i’m met with this view: 

I have tried to wait for a few minutes - nothing happens.
I have tried to switch browser - nothing happens, same result.

Has anyone encountered this issue before - and what is the solution? :)