Make sure that you're using the latest version of happn, that you're connected to the internet (WI-FI / 3G / 4G), that your Facebook account is still active and that your username and password are correct. Log out of Facebook through the application and from your web browser, which must allow cookies, then try to log in again.

If the problem persists, please try again later. It's usually temporary. Otherwise, to ensure that your request is handled quickly and correctly, please log into Facebook at the bottom of this page and access the contact form of our Customer Service. Please indicate your email address and select the reason for your problem.