As of build 333, the notification emails no longer contain the user account name or password when you have chosen to create/reset Office 365 accounts.
This issue affects hotfix 6 (4.15.1.333) as well as hotfix 7 (4.15.1.342).
The product team is working on a new build to address this and ETA is by the end of next week June 15, 2018.
WORKAROUND:
Install a build of MNE prior to 4.15.1.333.
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