One or more users need an assigned license in order to retain an Exchange Online mailbox. Create a new view and select "Users with mailboxes and no licenses." Select all users in the list, and then click "Edit" to assign licenses.How to assign Exchange Online license with azure group-based licensing?
Licensing a mailbox can be from Microsoft 365 admin center, or another way is to assign Office 365 licenses with Azure group-based licensing. Create user account with Exchange Online mailbox and assign EXO license (correct) We will create an on-premises AD user account for the user Megan with an Exchange Online mailbox.How do I assign licenses to users?
When you use the Active users page to assign licenses, you assign users licenses to products. In the admin center, go to the Users > Active users page. In the admin center, go to the Users > Active users page. Select the circles next to the names of the users that you want to assign licenses to.What happens when I change the license assigned to an existing user?
If you change the license that's assigned to an existing user, the settings in the mailbox plan that's associated with the new license are applied to the user's existing mailbox. The following table describes the mailbox plans that you're likely to see in Exchange Online.