Office 365 – Microsoft. Exchange.Data.Storage. UserHasNoMailboxException

While playing around with Office 365 I bumped into an issue, which you might also could face. I created an administrator role in Azure Active Directory and activated my Office 365 E3 License (thank you Microsoft for this free license!). After setting up my tenant properly I assumed I could log into my Office 365 mailbox. But the I faced this error here…

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…hmm and when I tried to add the user in the Exchange admin console to add a mailbox I saw this greyed out “pencil” sign…

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