Our plugin will generate a unique 2FA random token(text) along with an incremental serialnumber. As 2FA tokens are encrypted we cannot retrieve a token for you.
Once generated, the created email will be handed over to your WordPress installation using wp_mail() to be actually sent over the internet.
That means that after that we have no control about delivery or speed of delivery.
As always, it is best to use a SMTP plugin (any would suffice) and if you can use SMTP to use your current emailprovider. In that way 2FA messages are delivered near realtime. Also … your ordermessages or contactforms will also be delivered in a reliable way using SMTP.
Besides this, if you want to switch to a token generator, view this page for instructions.