I couldn't get the code to work. It made me re-log in, then re-enter the code...
Sounds like a typical case of blocked cookies. Other blocked content could potentially cause this issue as well.
If you use Firefox, type about:profiles
into the address bar and create a new profile. It will be set as your new default, which is not what you want, so click the "Set as default profile" button below your original profile. Then click the "Launch profile in new browser" button next to the new profile. This gets you a clean slate with no add-ons and the default settings.
For Chrome, see directions for creating and using profiles
Alternatively, you can make sure that all cookies are accepted, and add-ons aren't allowed to run in Private Browsing / Incognito Mode, then try again in a Private Browsing / Incognito window.