Resend a user's password in Office 365 - Admin Help
This article explains how to resend the notification email to a new user in Office 365. You can do this by resetting the user's password.
You must be an Office 365 global admin or password administrator to perform these steps.
Sign in to Office 365 with your work or school account.
Go to the Office 365 admin center .
On the Active users page, choose the users and then choose Reset password.
Follow the instructions on the Reset password page.
Make sure you send the notification to an email address where your user can get it, and follow up with them to make sure they got it.