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Did you use your active key to authorize? The beta interface can be a bit confusing, we are giving @fabien as much feedback as we can.

Can you walk me through what you are experiencing and then we can see what the problem is?

it asks for my posting key. I have tried the website and desktop app.
After entering username and posting key it takes me to the next screen with authorize or cancel buttons. after hitting authorize nothing happens.

Edit: I used active key and it was successful.

Will give fabien that feedback, authorize needs active key so it should net ask for posting :/