Thanks for coming back to us abawden,
Have you deleted the app and re-installed it, this may help? The only other option we have is to un-register all devices connected and see if you can log in this way with your original email this way.
If this fails, we can then get an IT ticket raised and see why your unable to log on with your email address.
I will pop you over a private message to take some details from you, please click on the purple envelope to accept the chat.
Kind regards Jodi.