Seems this has been brought up, but I don’t see a solution as of yet.
I get errors whenever trying to access/refresh a folder that reads:
[IMAP] Cannot open folder “firstname.lastname@example.org/Inbox/”. (User is authenticated but not connected.)
I get the error when initially starting eM Client as well as trying to open Trash, Sent, or any folder.
It is an Outlook.com account, but with my own domain name.