Tiller seems to have a lot of connection issues with Northern Bank & Trust. I don’t have 2FA enabled nor is it an option, but it is always a 2 step verification process getting them to talk to each other.
When it works, it is a very slow process, taking several minutes (connection delays) to complete both steps. When it fails, like today (which happens often) I see this screen:
I have checked the Outage Database and NB&T is not listed. Please look into this ongoing issue with NB&T.