Login to Proofpoint Essentials Portal with Office 365 Account

Prerequisites
You must have Azure Active Directory sync configured.
Verify that Disable login with O365 credentials is NOT checked under Company Settings > Import Users > Azure Active Directory

Logging In With Office 365
Go to your Proofpoint Essentials account login page.
Under Or log in with click Office 365 Account.
Link will redirect you to a Microsoft account login page.
Enter your O365 credentials.
If successful, login will redirect you back to Proofpoint Essentials and you will be automatically signed into your account.

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