Error isn t a mailbox user. Dec 27, 2025 · Check Mailbox Size and Connectivity: Ensure the mailbox isn’t full or restricted due to size limits. Check your Azure AD Connect synchronization logs (if applicable) or the service health dashboard in the Microsoft 365 Admin Center. com" Jun 25, 2025 · Provides a workaround for an issue in which you can't remove a remote shared mailbox in on-premises Exchange admin center because it uses the Remove-Mailbox cmdlet that can't find the specified mailbox object. After calling the user, we can confirm that the user can’t sign in to the mailbox. Without knowing the details, it will be hard to give ideas where to look. I have tried waiting an hour and trying again, but it didn’t make a difference. com Run AAD Connect delta sync. ” Workaround Use powershell on the on-premise Exchange: Remove-remotemailbox –identity testdelt@domain. Any Oct 8, 2019 · Then when you try to delete it from the ECP on the on-premise Exchange server: … “isn’t a mailbox user. You could also delete the user account, for the shared mailbox, and force a AAD Connect delta sync. Sep 29, 2022 · The mailbox cant be deleted from the Exchange admin center, but you can remove it with PowerShell On Exchange hybrid server Open Exchange Management Shell (run as Administrator) Remove-RemoteMailbox -identity "user@domain. 3. even from exchange online i am unable to delete. Jul 18, 2021 · When i try to delete this shared mailbox from exchange onprem i am getting below error. Jun 25, 2025 · When you can't send or receive Microsoft 365 email, use these steps to find and fix problems with Outlook. Likewise, none of the other users have that email as an alias. It was running command 'get-mailuser -ReadFromDomainController -Identity 'domain/OU/User''. Dec 6, 2022 · Step 3: How to resolve the ‘Recipient is not a mailbox’ error? A. Nov 22, 2022 · Office 365 migration failed with "The Recipient is not a mailbox" error? Discover the causes and step-by-step solutions to fix the issue. can i delete it from Active Directory is this the right approach. What is the solution to Exchange database is mandatory on UserMailbox warning? This issue occurs because Outlook Web App Premium cannot create a security context if the user does not have a mailbox. Wait 15-30 minutes. I can add the alias back. It’s shows the warning in the details pane after selecting the user in the mailboxes list view. error SharedMailbox isn't a mailbox user Jun 3, 2020 · Below is the script that I run and I'm getting result in Excel, but sometimes I got "The specified mailbox "xxxxxxx" isn't unique" when querying a user with multiple AD accounts in same Display Name but different email address. What was deleted? How were the deletions done? Jun 1, 2010 · User not a mailbox user When I open the properties for the 'Mail User' in the Exchange Management Console I get the following error: domain/OU/User is not a mail-enabled user. Stuck Provisioning: Occasionally, a glitch may cause delays longer than an hour. If I select to remove the mailbox from EMC, the user will also be removed. Check if the GUID property is set Open the Exchange Management Shell on the On-premises Exchange and run the following command- Jun 25, 2025 · When a user is created or changed in Microsoft 365, or synced to Microsoft Entra ID from the on-premises environment, either no mailbox is provisioned for the user, or the change isn't reflected in Exchange Online. When the Mailbox Isn’t Visible New User: The mailbox might still be in the process of being created. Jun 25, 2025 · A Microsoft 365 user tries to open another user's Microsoft Outlook mailbox folder to which the user was granted access. Also, verify there are no connectivity issues or errors displayed on the mailbox details. Run a Mailbox Repair Request If the mailbox is visible in Jun 14, 2024 · But when I run the Powershell command Get-Mailbox [email protected] | select -expand emailaddresses alias, [email protected] isn’t on the list (the other aliases are). Yeah get-remotemailbox returns the user details when using exchange shell on the on prem server, but when connected to exchange online via powershell the user isn’t visible. However, the mailbox folder doesn't open. Restore the ad object you deleted from recycle bin? A group shouldn't break a mailbox. When Outlook Web App Premium uses an Exchange Server 2010 Client Access server to redirect the request to another server, Outlook Web App Premium requires a mailbox to create a security context. . Apr 30, 2024 · The warning Exchange database is mandatory on UserMailbox appears in Exchange Admin Center. nlbjxqa hzwjzg ksmmoyt kerkj urpfi wfyxhva elt myl ezsdn kdk