Here’s how you can reinstate an Exchange Online service if you see exception on your Mailbox by procuring an Exchange Online enabled license.
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Exchange Online Mailbox License Error | Exception Missing Exchange License
In case you are setting up your M365 and setting up Exchange Online in the process, your Email URL is: https://outlook.office365.com/mail/ But, you see the below error which reads as err: Microsoft.Exchange.Clients.Owa2.Server.Core.OwaUserHasNoMailboxAndNoLicenseAssignedException Here’s why you see the Exception.
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