A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.
Hello
According to the error message - This normally means the entire Microsoft 365 organization, or tenant, has been blocked from Exchange Online. It is not usually caused by the browser, Outlook cache, or the computer itself. Common causes include an expired or suspended Microsoft 365 subscription, an unpaid balance, or an administrative or compliance hold.
Are you the global admin user? If not, contact your organization IT department.
If you are, log into admin center https://admin.microsoft.com to review license status.