Our customer just started using the Duo free trial successfully. The users cellphones get the Duo push when they login. We provide them with IT support using LogMeIn and generally do our work when customer is not there. When we login to the system we have to use their username/login that they use. How do we do this if the push notification goes to their cellphone? Is there a backup phone# we can add that is ours or something? Thanks in advance!