I did try Aliases, after deleting the original username (and adding it to the alias field as per the instructions) when trying to login to the site I chose to test this I am prompted by the message:
Two-factor authentication enhances the security of your account by using a secondary device to verify your identity. This prevents anyone but you from accessing your account, even if they know your password.
This process will help you set up your account with this added layer of security.
So it seems like it has lost that login ability. Any ideas?
Also, this does not seem to link me as an Administrator in Duo with me as the multiple users in Duo neither.
Surely many more users are in the same situation.