We are using McAfee One Time Password with SMS Gateway delivery option. Sometimes we have received more than one SMS password when the user was logged succesfully.
Is there any information, settings about this situation?
Didnt see this post until now, but this could happen because of the SMS provider detects that the message did not make it to the user.
In general OTP will only attempt to deliver the message once. This can be checked otpaccess.log.