Adds an extra layer of security to your WordPress Account. Same as Google 2-step verification.
Codes are time-dependent. Make sure your phone is set to the correct local time. If your server time is incorrect, click Sync now at top right of overview page
The plugin uses wordpress built-in function to send email. If email function not work you can try some plugin to help sending email over SMTP like
WP Mail Bank,
WP Mail SMTP,
Yes, it does. You can
network active it, it work with all users no matter if your site is multisite or not
If an user turn it
ON that mean he will be asked for code once login on all sites whole the network.