Hello,
I have got an identical problem as stated here with my private account and the domain norman-web.de
The ID-Service says I have to upgrade to atlassian ID and verify my mail address, but that is not possible, because I do not get any mails to the mail address of the account.
My mail address was not working for a time and it seems the Atlassian mail server set it on a skip-list.
If someone could be so kind to help, that would be very much appreciated!