MB has disabled the email/pin authentication process. This release brings a new way to add the needed login information.
The input of an Access and Refresh Token is required, now.
See here for help regarding the token creation. (Docs are work in progress)
It is not needed to delete your integration/authentication on upgrade. The new procedure is needed only when you have to update your access tokens in case of failures....
Thanks to my sponsors and all the testers of the beta version and the new token tooling.