Cannot access Primary Email in Firefox Account. There is no Secondary Email set.

A previous company employee set up a Firefox Account, that we release a Firefox Add-On against. This person set up their work account as the Firefox Account Primary Email and did not set up a Secondary Account. This person left the company, and their email account is no longer available. We now need to update the Add-On. We have authentication information to log into the account, but when we try to access the Add-On/Extension location, the system sends a verification code to the Primary Email. We cannot even set a Secondary Email for the same reason. What can we do since creating a new account will not allow us to access and update the existing Add-On?