Disable Office 365 portal alerts for admin - Microsoft Community
https://answers.microsoft.com/en-us/msoffice/forum/all/disable-office-365-portal-alerts-for-admin/d1aed065-6c86-4e8c-87a2-9ad419b3f8f2
webSep 2, 2016 · Generally, we can turn off notifications via clicking the gear icon in the upper right corner > office 365 settings > notifications > untick all options > save. However, for some important notifications like subscription expires, domain issues and etc., they are only visible for Admin and aimed at making Admin not miss any important messages.
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