If you have 2FA enabled on your BI Account you can no longer login into Workbench (new login).
If you try to login you instantly get the following error in the log file and cannot login at all.

[RestApi] ID:[7] TYPE:[EBREQ_USER_DirectLogin] Error Code:422 - Missing data, apiCode="", message="Missing 2FA token"

Not sure if im missing something, but the login form in Workbench does not have a field or asks for any 2FA:

To login again you have to disable 2FA, login into Workbench and enable 2FA again.