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.
We highly recommend using Brevo (a french company).