I struggled with an office 365 mailbox issue in a Hybrid environment where a user had the Exchange Online Plan 2 license but received the error that we are preparing a mailbox for the user. I waited for 4 days and tried some steps but unfortunately none of them worked. I was able to fix the error and would like to discuss the same in this article.
I had accessed connect-msolservice module and ensured that no errors on the user account. The command that I used to check the status is below. It’s worth to clear any errors when troubleshooting the mailbox issues.
(Get-MsolUser -UserPrincipalName firstname.lastname@example.org).errors.ErrorDetail.objecterrors.errorrecord.ErrorDescription
The command normally shows any errors on a user account from Azure AD. Thankfully, no errors on the affected mailbox. Also, verified that no email address conflicts and all seems to be ok.
I even tried the Redo-MsolProvisionUser command to see if it makes any difference but in vain. Redo-MsolProvisionUser retries the provisioning of a user object in Azure Active Directory.
I decided to try different steps and it worked.
- Go to “Exchange On-Premise”
- Access “Exchange Management Shell”
- Disable the affected mailbox.
Note: I strongly advise not to use remove-mailbox as they remove the AD account that is associated with a mailbox. It is recommended to use the disable command.
- I waited for the changes to replicate. After sync, the account had no mailbox in the cloud but it was listed in the soft-deleted which is normal.
- After that, enabled the on-premise object again using the Enable-Mailbox command.
Note: If no AD account available, the Enable-mailbox command will not work.
- After the sync is completed, initiated migration to Exchange Online from on-premise and assign a respective license.
- Guess what. After the migration is completed, we are preparing a mailbox for the user error is disappeared.
Yes, we should move a data from a soft-deleted mailbox otherwise the user would kill me so performed mailbox restore request to the active mailbox.
To get more information, visit the Microsoft website.
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