I am dealing with this right now. I do not get the one-time code and the tech support is closed. I have a user that is down and I cannot help . This is ridiculous! Time to find a new solution...
@mannyc Sorry for the frustrations.
Were you able to recieve the RBA communications thereafter?
If the Emails are still failing, we can see if there's been a block placed on that address due to too many returns.