Failing to enable

When I try to enable authy on my user account nothing happens. When I press the enable/disable button the pop-up does show up but when I enter my country and phone number and press continue it just returns to the same form with the input fields emptied.

I’m testing this on a local domain (wordpress.local); could this be the cause of the problem?

I’m using WordPress 3.5, Authy Two Factor Authentication 1.1 and all other plugins are disabled. I’ve tried both the production and API testing keys.

I’ve already reinstalled the plugin because the first time the enable/disable button didn’t show up at all just the input fields and in that case I wasn’t able to enable it either. After the first install it did add some user meta to the database where I noticed the correct phone number and country code was stored, force_by_admin set to FALSE and authy_id to NULL. After the second install I removed the user meta and it didn’t store any new.

https://www.ads-software.com/extend/plugins/authy-two-factor-authentication/