Can no longer access to the dashboard

Bug:
I had used my promo code and all right but then, after 5h since i activated it is saying that i have to put another code and i can0t enter to my dashboard.

How can we reproduce the bug?
I don’t know, try to get one code with new account, use it, wait and then try to enter to the dashboard.

What platform are you running on?
Windows/GoogleChrome

Are you using more than one Google account on your computer?