In most cases, an authentication error indicates that there is something wrong with the login data. Some things that might help with such an error message are:
- Log out once and log in again.
- Reinstall the application once (it is best to uninstall the application first, then reboot your device and then do a new download and installation from our download page).
- Change/reset your password once (if you are still logged in to our website, you can go to "My profile > My profile" at the top right. If you are no longer logged in, you can press the reset password link on the login page.
If this doesn't work, please contact our support at firstname.lastname@example.org.