When running Easy365Manager for the first time you’re met with the following error message:

This indicates that you need to perform authentication with Office 365.
Authentication consists of two parts:
- Authenticate with MS Graph (for Office 365 user and license management)
- Authenticate with Exchange Online (for Office 365 mailbox management)
Click on the login button [→] to initiate authentication. You must perform this twice: One time for MS Graph and one time for Exchange Online. The accounts used must have the necessary rights to perform user, license, and mailbox management in Office 365.
Your login is cached with secure encryption, so you don’t have to log in every time you start AD Users & Computers.