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make sure you delete migration job for the affected user. <br>Also - look at user attributes directly, either in ADSI-edit - default naming context or in AD users and computers, choose VIEW and then choose ADVANCED FEATURES, open user properties and choose attribute editor. <br>look at ProxyAddresses there
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MNESupport

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Hi, I am having a weird issue with migrating a mailbox to Office 365. We are a hybrid environment and in the process of migrating all mailboxes off prem to O365. I ran into an issue with one user where i received an office 365 Error: MigrationPermanentExceptio<wbr />n: You can‎'t use the domain because it‎'s not an accepted domain for your organization. --&gt; You can‎'t use the domain because it‎'s not an accepted domain for your organization. &nbsp;This has happened before and I went and removed the domain in question, ran adconnect sync and ran the migration again and it was fine. Not this time. I am still getting the same error even though i cannot find any traces of the domain that caused it to fail. I have run the migration 4 times and still fails with the same error. &nbsp;Waiting to hear back from MS Support escalation. Any insight is greatly appreciated.
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Hi, I am having a weird issue with migrating a mailbox to Office 365. We are a hybrid environment and in the process of migrating all mailboxes off prem to O365. I ran into an issue with one user where i received an office 365 Error: MigrationPermanentException: You can‎'t use the domain because it‎'s not an accepted domain for your organization. --> You can‎'t use the domain because it‎'s not an accepted domain for your organization.  This has happened before and I went and removed the domain in question, ran adconnect sync and ran the migration again and it was fine. Not this time. I am still getting the same error even though i cannot find any traces of the domain that caused it to fail. I have run the migration 4 times and still fails with the same error.  Waiting to hear back from MS Support escalation. Any insight is greatly appreciated.

O365 Migration Failing, not an accepted domain

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

Microsoft Office

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.