Microsoft 365 - How To
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      Block a Former Employee's Access to Email (Exchange Online)

      In the Office 365 Exchange admin center to follow these steps to block your former employee from accessing their email.

      1. Go to the Exchange admin center.
      2. In the Exchange admin center, navigate to Recipients > Mailboxes.
      3. Double-click the user and go to the Mailbox features page. Under Mobile Devices, select Disable Exchange ActiveSync and Disable OWA for Devices, and answer Yes to both when prompted.
      4. Under Email Connectivity, select Disable and answer Yes when prompted.

       

      Source: https://docs.microsoft.com/en-us/office365/admin/add-users/remove-former-employee?view=o365-worldwide#wipe-and-block-a-former-employees-mobile-device