Actions To fix this, you'll need to assign a license to that user's account. Go to the Active Users page. Check the box next ...

Actions
To fix this, you'll need to assign a license to that user's account.
  1. Go to the Active Users page.
  2. Check the box next to the name of the user that you need to assign a license.
  3. Click Edit or Manage email aliases on the right pane.
  4. On the next page, select Licenses on the left navigation menu.
  5. Under Assign Licenses, select the box for the license you want to assign. Make sure you assign a license that includes Exchange Online. Use the arrow next to the license name to see what services the license offers.
  6. Choose Save.
Tips:
  • If you don't have any Office 365 licenses available, you'll need to purchase one before you can assign it to this user. You can purchase more licenses from the Manage Subscriptions Page.
  • To view a list of all your unlicensed users, go to the Active Users page, click Select a view and select Unlicensed users
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